openwrt/target/linux/generic/pending-5.15/530-jffs2_make_lzma_available.patch

From: Alexandros C. Couloumbis <[email protected]>
Subject: fs: add jffs2/lzma support (not activated by default yet)

lede-commit: c2c88d315fa0e881f8b19da07b62859b915b11b2
Signed-off-by: Alexandros C. Couloumbis <[email protected]>
---
 fs/jffs2/Kconfig             |    9 +
 fs/jffs2/Makefile            |    3 +
 fs/jffs2/compr.c             |    6 +
 fs/jffs2/compr.h             |   10 +-
 fs/jffs2/compr_lzma.c        |  128 +++
 fs/jffs2/super.c             |   33 +-
 include/linux/lzma.h         |   62 ++
 include/linux/lzma/LzFind.h  |  115 +++
 include/linux/lzma/LzHash.h  |   54 +
 include/linux/lzma/LzmaDec.h |  231 +++++
 include/linux/lzma/LzmaEnc.h |   80 ++
 include/linux/lzma/Types.h   |  226 +++++
 include/uapi/linux/jffs2.h   |    1 +
 lib/Kconfig                  |    6 +
 lib/Makefile                 |   12 +
 lib/lzma/LzFind.c            |  761 ++++++++++++++
 lib/lzma/LzmaDec.c           |  999 +++++++++++++++++++
 lib/lzma/LzmaEnc.c           | 2271 ++++++++++++++++++++++++++++++++++++++++++
 lib/lzma/Makefile            |    7 +
 19 files changed, 5008 insertions(+), 6 deletions(-)
 create mode 100644 fs/jffs2/compr_lzma.c
 create mode 100644 include/linux/lzma.h
 create mode 100644 include/linux/lzma/LzFind.h
 create mode 100644 include/linux/lzma/LzHash.h
 create mode 100644 include/linux/lzma/LzmaDec.h
 create mode 100644 include/linux/lzma/LzmaEnc.h
 create mode 100644 include/linux/lzma/Types.h
 create mode 100644 lib/lzma/LzFind.c
 create mode 100644 lib/lzma/LzmaDec.c
 create mode 100644 lib/lzma/LzmaEnc.c
 create mode 100644 lib/lzma/Makefile

--- a/fs/jffs2/Kconfig
+++ b/fs/jffs2/Kconfig
@@ -136,6 +136,15 @@ config JFFS2_LZO
 	  This feature was added in July, 2007. Say 'N' if you need
 	  compatibility with older bootloaders or kernels.
 
+config JFFS2_LZMA
+	bool "JFFS2 LZMA compression support" if JFFS2_COMPRESSION_OPTIONS
+	select LZMA_COMPRESS
+	select LZMA_DECOMPRESS
+	depends on JFFS2_FS
+	default n
+	help
+	  JFFS2 wrapper to the LZMA C SDK
+
 config JFFS2_RTIME
 	bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS
 	depends on JFFS2_FS
--- a/fs/jffs2/Makefile
+++ b/fs/jffs2/Makefile
@@ -19,4 +19,7 @@ jffs2-$(CONFIG_JFFS2_RUBIN)	+= compr_rub
 jffs2-$(CONFIG_JFFS2_RTIME)	+= compr_rtime.o
 jffs2-$(CONFIG_JFFS2_ZLIB)	+= compr_zlib.o
 jffs2-$(CONFIG_JFFS2_LZO)	+= compr_lzo.o
+jffs2-$(CONFIG_JFFS2_LZMA)	+= compr_lzma.o
 jffs2-$(CONFIG_JFFS2_SUMMARY)   += summary.o
+
+CFLAGS_compr_lzma.o += -Iinclude/linux -Ilib/lzma
--- a/fs/jffs2/compr.c
+++ b/fs/jffs2/compr.c
@@ -378,6 +378,9 @@ int __init jffs2_compressors_init(void)
 #ifdef CONFIG_JFFS2_LZO
 	jffs2_lzo_init();
 #endif
+#ifdef CONFIG_JFFS2_LZMA
+	jffs2_lzma_init();
+#endif
 /* Setting default compression mode */
 #ifdef CONFIG_JFFS2_CMODE_NONE
 	jffs2_compression_mode = JFFS2_COMPR_MODE_NONE;
@@ -401,6 +404,9 @@ int __init jffs2_compressors_init(void)
 int jffs2_compressors_exit(void)
 {
 /* Unregistering compressors */
+#ifdef CONFIG_JFFS2_LZMA
+	jffs2_lzma_exit();
+#endif
 #ifdef CONFIG_JFFS2_LZO
 	jffs2_lzo_exit();
 #endif
--- a/fs/jffs2/compr.h
+++ b/fs/jffs2/compr.h
@@ -29,9 +29,9 @@
 #define JFFS2_DYNRUBIN_PRIORITY  20
 #define JFFS2_LZARI_PRIORITY     30
 #define JFFS2_RTIME_PRIORITY     50
-#define JFFS2_ZLIB_PRIORITY      60
-#define JFFS2_LZO_PRIORITY       80
-
+#define JFFS2_LZMA_PRIORITY      70
+#define JFFS2_ZLIB_PRIORITY      80
+#define JFFS2_LZO_PRIORITY       90
 
 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
 #define JFFS2_DYNRUBIN_DISABLED  /*	   for decompression */
@@ -101,5 +101,9 @@ void jffs2_zlib_exit(void);
 int jffs2_lzo_init(void);
 void jffs2_lzo_exit(void);
 #endif
+#ifdef CONFIG_JFFS2_LZMA
+int jffs2_lzma_init(void);
+void jffs2_lzma_exit(void);
+#endif
 
 #endif /* __JFFS2_COMPR_H__ */
--- /dev/null
+++ b/fs/jffs2/compr_lzma.c
@@ -0,0 +1,128 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * JFFS2 wrapper to the LZMA C SDK
+ *
+ */
+
+#include <linux/lzma.h>
+#include "compr.h"
+
+#ifdef __KERNEL__
+	static DEFINE_MUTEX(deflate_mutex);
+#endif
+
+CLzmaEncHandle *p;
+Byte propsEncoded[LZMA_PROPS_SIZE];
+SizeT propsSize = sizeof(propsEncoded);
+
+STATIC void lzma_free_workspace(void)
+{
+	LzmaEnc_Destroy(p, &lzma_alloc, &lzma_alloc);
+}
+
+STATIC int INIT lzma_alloc_workspace(CLzmaEncProps *props)
+{
+	if ((p = (CLzmaEncHandle *)LzmaEnc_Create(&lzma_alloc)) == NULL)
+	{
+		PRINT_ERROR("Failed to allocate lzma deflate workspace\n");
+		return -ENOMEM;
+	}
+
+	if (LzmaEnc_SetProps(p, props) != SZ_OK)
+	{
+		lzma_free_workspace();
+		return -1;
+	}
+
+	if (LzmaEnc_WriteProperties(p, propsEncoded, &propsSize) != SZ_OK)
+	{
+		lzma_free_workspace();
+		return -1;
+	}
+
+	return 0;
+}
+
+STATIC int jffs2_lzma_compress(unsigned char *data_in, unsigned char *cpage_out,
+			      uint32_t *sourcelen, uint32_t *dstlen)
+{
+	SizeT compress_size = (SizeT)(*dstlen);
+	int ret;
+
+	#ifdef __KERNEL__
+		mutex_lock(&deflate_mutex);
+	#endif
+
+	ret = LzmaEnc_MemEncode(p, cpage_out, &compress_size, data_in, *sourcelen,
+		0, NULL, &lzma_alloc, &lzma_alloc);
+
+	#ifdef __KERNEL__
+		mutex_unlock(&deflate_mutex);
+	#endif
+
+	if (ret != SZ_OK)
+		return -1;
+
+	*dstlen = (uint32_t)compress_size;
+
+	return 0;
+}
+
+STATIC int jffs2_lzma_decompress(unsigned char *data_in, unsigned char *cpage_out,
+				 uint32_t srclen, uint32_t destlen)
+{
+	int ret;
+	SizeT dl = (SizeT)destlen;
+	SizeT sl = (SizeT)srclen;
+	ELzmaStatus status;
+
+	ret = LzmaDecode(cpage_out, &dl, data_in, &sl, propsEncoded,
+		propsSize, LZMA_FINISH_ANY, &status, &lzma_alloc);
+
+	if (ret != SZ_OK || status == LZMA_STATUS_NOT_FINISHED || dl != (SizeT)destlen)
+		return -1;
+
+	return 0;
+}
+
+static struct jffs2_compressor jffs2_lzma_comp = {
+	.priority = JFFS2_LZMA_PRIORITY,
+	.name = "lzma",
+	.compr = JFFS2_COMPR_LZMA,
+	.compress = &jffs2_lzma_compress,
+	.decompress = &jffs2_lzma_decompress,
+	.disabled = 0,
+};
+
+int INIT jffs2_lzma_init(void)
+{
+	int ret;
+	CLzmaEncProps props;
+	LzmaEncProps_Init(&props);
+
+	props.dictSize = LZMA_BEST_DICT(0x2000);
+	props.level = LZMA_BEST_LEVEL;
+	props.lc = LZMA_BEST_LC;
+	props.lp = LZMA_BEST_LP;
+	props.pb = LZMA_BEST_PB;
+	props.fb = LZMA_BEST_FB;
+
+	ret = lzma_alloc_workspace(&props);
+	if (ret < 0)
+		return ret;
+
+	ret = jffs2_register_compressor(&jffs2_lzma_comp);
+	if (ret)
+		lzma_free_workspace();
+
+	return ret;
+}
+
+void jffs2_lzma_exit(void)
+{
+	jffs2_unregister_compressor(&jffs2_lzma_comp);
+	lzma_free_workspace();
+}
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -374,14 +374,41 @@ static int __init init_jffs2_fs(void)
 	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
 	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
 
-	pr_info("version 2.2."
+	pr_info("version 2.2"
 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	       " (NAND)"
 #endif
 #ifdef CONFIG_JFFS2_SUMMARY
-	       " (SUMMARY) "
+	       " (SUMMARY)"
 #endif
-	       " © 2001-2006 Red Hat, Inc.\n");
+#ifdef CONFIG_JFFS2_ZLIB
+	       " (ZLIB)"
+#endif
+#ifdef CONFIG_JFFS2_LZO
+	       " (LZO)"
+#endif
+#ifdef CONFIG_JFFS2_LZMA
+	       " (LZMA)"
+#endif
+#ifdef CONFIG_JFFS2_RTIME
+	       " (RTIME)"
+#endif
+#ifdef CONFIG_JFFS2_RUBIN
+	       " (RUBIN)"
+#endif
+#ifdef  CONFIG_JFFS2_CMODE_NONE
+	       " (CMODE_NONE)"
+#endif
+#ifdef CONFIG_JFFS2_CMODE_PRIORITY
+	       " (CMODE_PRIORITY)"
+#endif
+#ifdef CONFIG_JFFS2_CMODE_SIZE
+	       " (CMODE_SIZE)"
+#endif
+#ifdef CONFIG_JFFS2_CMODE_FAVOURLZO
+	       " (CMODE_FAVOURLZO)"
+#endif
+	       " (c) 2001-2006 Red Hat, Inc.\n");
 
 	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
 					     sizeof(struct jffs2_inode_info),
--- /dev/null
+++ b/include/linux/lzma.h
@@ -0,0 +1,62 @@
+#ifndef __LZMA_H__
+#define __LZMA_H__
+
+#ifdef __KERNEL__
+	#include <linux/kernel.h>
+	#include <linux/sched.h>
+	#include <linux/slab.h>
+	#include <linux/vmalloc.h>
+	#include <linux/init.h>
+	#define LZMA_MALLOC vmalloc
+	#define LZMA_FREE vfree
+	#define PRINT_ERROR(msg) printk(KERN_WARNING #msg)
+	#define INIT __init
+	#define STATIC static
+#else
+	#include <stdint.h>
+	#include <stdlib.h>
+	#include <stdio.h>
+	#include <unistd.h>
+	#include <string.h>
+	#include <asm/types.h>
+	#include <errno.h>
+	#include <linux/jffs2.h>
+	#ifndef PAGE_SIZE
+		extern int page_size;
+		#define PAGE_SIZE page_size
+	#endif
+	#define LZMA_MALLOC malloc
+	#define LZMA_FREE free
+	#define PRINT_ERROR(msg) fprintf(stderr, msg)
+	#define INIT
+	#define STATIC
+#endif
+
+#include "lzma/LzmaDec.h"
+#include "lzma/LzmaEnc.h"
+
+#define LZMA_BEST_LEVEL (9)
+#define LZMA_BEST_LC    (0)
+#define LZMA_BEST_LP    (0)
+#define LZMA_BEST_PB    (0)
+#define LZMA_BEST_FB  (273)
+
+#define LZMA_BEST_DICT(n) (((int)((n) / 2)) * 2)
+
+static void *p_lzma_malloc(void *p, size_t size)
+{
+	if (size == 0)
+		return NULL;
+
+	return LZMA_MALLOC(size);
+}
+
+static void p_lzma_free(void *p, void *address)
+{
+	if (address != NULL)
+		LZMA_FREE(address);
+}
+
+static ISzAlloc lzma_alloc = { .Alloc = p_lzma_malloc, .Free = p_lzma_free };
+
+#endif
--- /dev/null
+++ b/include/linux/lzma/LzFind.h
@@ -0,0 +1,98 @@
+/* LzFind.h -- Match finder for LZ algorithms
+2009-04-22 : Igor Pavlov : Public domain */
+
+#ifndef __LZ_FIND_H
+#define __LZ_FIND_H
+
+#include "Types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef UInt32 CLzRef;
+
+typedef struct _CMatchFinder
+{
+  Byte *buffer;
+  UInt32 pos;
+  UInt32 posLimit;
+  UInt32 streamPos;
+  UInt32 lenLimit;
+
+  UInt32 cyclicBufferPos;
+  UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
+
+  UInt32 matchMaxLen;
+  CLzRef *hash;
+  CLzRef *son;
+  UInt32 hashMask;
+  UInt32 cutValue;
+
+  Byte *bufferBase;
+  ISeqInStream *stream;
+  int streamEndWasReached;
+
+  UInt32 blockSize;
+  UInt32 keepSizeBefore;
+  UInt32 keepSizeAfter;
+
+  UInt32 numHashBytes;
+  int directInput;
+  size_t directInputRem;
+  int btMode;
+  int bigHash;
+  UInt32 historySize;
+  UInt32 fixedHashSize;
+  UInt32 hashSizeSum;
+  UInt32 numSons;
+  SRes result;
+  UInt32 crc[256];
+} CMatchFinder;
+
+#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
+#define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])
+
+#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
+
+void MatchFinder_Construct(CMatchFinder *p);
+
+/* Conditions:
+     historySize <= 3 GB
+     keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
+*/
+int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
+    UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
+    ISzAlloc *alloc);
+void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
+
+/*
+Conditions:
+  Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
+  Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
+*/
+
+typedef void (*Mf_Init_Func)(void *object);
+typedef Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
+typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
+typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
+typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
+typedef void (*Mf_Skip_Func)(void *object, UInt32);
+
+typedef struct _IMatchFinder
+{
+  Mf_Init_Func Init;
+  Mf_GetIndexByte_Func GetIndexByte;
+  Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
+  Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
+  Mf_GetMatches_Func GetMatches;
+  Mf_Skip_Func Skip;
+} IMatchFinder;
+
+void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- /dev/null
+++ b/include/linux/lzma/LzHash.h
@@ -0,0 +1,54 @@
+/* LzHash.h -- HASH functions for LZ algorithms
+2009-02-07 : Igor Pavlov : Public domain */
+
+#ifndef __LZ_HASH_H
+#define __LZ_HASH_H
+
+#define kHash2Size (1 << 10)
+#define kHash3Size (1 << 16)
+#define kHash4Size (1 << 20)
+
+#define kFix3HashSize (kHash2Size)
+#define kFix4HashSize (kHash2Size + kHash3Size)
+#define kFix5HashSize (kHash2Size + kHash3Size + kHash4Size)
+
+#define HASH2_CALC hashValue = cur[0] | ((UInt32)cur[1] << 8);
+
+#define HASH3_CALC { \
+  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
+  hash2Value = temp & (kHash2Size - 1); \
+  hashValue = (temp ^ ((UInt32)cur[2] << 8)) & p->hashMask; }
+
+#define HASH4_CALC { \
+  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
+  hash2Value = temp & (kHash2Size - 1); \
+  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
+  hashValue = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & p->hashMask; }
+
+#define HASH5_CALC { \
+  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
+  hash2Value = temp & (kHash2Size - 1); \
+  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
+  hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)); \
+  hashValue = (hash4Value ^ (p->crc[cur[4]] << 3)) & p->hashMask; \
+  hash4Value &= (kHash4Size - 1); }
+
+/* #define HASH_ZIP_CALC hashValue = ((cur[0] | ((UInt32)cur[1] << 8)) ^ p->crc[cur[2]]) & 0xFFFF; */
+#define HASH_ZIP_CALC hashValue = ((cur[2] | ((UInt32)cur[0] << 8)) ^ p->crc[cur[1]]) & 0xFFFF;
+
+
+#define MT_HASH2_CALC \
+  hash2Value = (p->crc[cur[0]] ^ cur[1]) & (kHash2Size - 1);
+
+#define MT_HASH3_CALC { \
+  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
+  hash2Value = temp & (kHash2Size - 1); \
+  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); }
+
+#define MT_HASH4_CALC { \
+  UInt32 temp = p->crc[cur[0]] ^ cur[1]; \
+  hash2Value = temp & (kHash2Size - 1); \
+  hash3Value = (temp ^ ((UInt32)cur[2] << 8)) & (kHash3Size - 1); \
+  hash4Value = (temp ^ ((UInt32)cur[2] << 8) ^ (p->crc[cur[3]] << 5)) & (kHash4Size - 1); }
+
+#endif
--- /dev/null
+++ b/include/linux/lzma/LzmaDec.h
@@ -0,0 +1,130 @@
+/* LzmaDec.h -- LZMA Decoder
+2009-02-07 : Igor Pavlov : Public domain */
+
+#ifndef __LZMA_DEC_H
+#define __LZMA_DEC_H
+
+#include "Types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* #define _LZMA_PROB32 */
+/* _LZMA_PROB32 can increase the speed on some CPUs,
+   but memory usage for CLzmaDec::probs will be doubled in that case */
+
+#ifdef _LZMA_PROB32
+#define CLzmaProb UInt32
+#else
+#define CLzmaProb UInt16
+#endif
+
+
+/* ---------- LZMA Properties ---------- */
+
+#define LZMA_PROPS_SIZE 5
+
+typedef struct _CLzmaProps
+{
+  unsigned lc, lp, pb;
+  UInt32 dicSize;
+} CLzmaProps;
+
+
+/* ---------- LZMA Decoder state ---------- */
+
+/* LZMA_REQUIRED_INPUT_MAX = number of required input bytes for worst case.
+   Num bits = log2((2^11 / 31) ^ 22) + 26 < 134 + 26 = 160; */
+
+#define LZMA_REQUIRED_INPUT_MAX 20
+
+typedef struct
+{
+  CLzmaProps prop;
+  CLzmaProb *probs;
+  Byte *dic;
+  const Byte *buf;
+  UInt32 range, code;
+  SizeT dicPos;
+  SizeT dicBufSize;
+  UInt32 processedPos;
+  UInt32 checkDicSize;
+  unsigned state;
+  UInt32 reps[4];
+  unsigned remainLen;
+  int needFlush;
+  int needInitState;
+  UInt32 numProbs;
+  unsigned tempBufSize;
+  Byte tempBuf[LZMA_REQUIRED_INPUT_MAX];
+} CLzmaDec;
+
+#define LzmaDec_Construct(p) { (p)->dic = 0; (p)->probs = 0; }
+
+/* There are two types of LZMA streams:
+     0) Stream with end mark. That end mark adds about 6 bytes to compressed size.
+     1) Stream without end mark. You must know exact uncompressed size to decompress such stream. */
+
+typedef enum
+{
+  LZMA_FINISH_ANY,   /* finish at any point */
+  LZMA_FINISH_END    /* block must be finished at the end */
+} ELzmaFinishMode;
+
+/* ELzmaFinishMode has meaning only if the decoding reaches output limit !!!
+
+   You must use LZMA_FINISH_END, when you know that current output buffer
+   covers last bytes of block. In other cases you must use LZMA_FINISH_ANY.
+
+   If LZMA decoder sees end marker before reaching output limit, it returns SZ_OK,
+   and output value of destLen will be less than output buffer size limit.
+   You can check status result also.
+
+   You can use multiple checks to test data integrity after full decompression:
+     1) Check Result and "status" variable.
+     2) Check that output(destLen) = uncompressedSize, if you know real uncompressedSize.
+     3) Check that output(srcLen) = compressedSize, if you know real compressedSize.
+        You must use correct finish mode in that case. */
+
+typedef enum
+{
+  LZMA_STATUS_NOT_SPECIFIED,               /* use main error code instead */
+  LZMA_STATUS_FINISHED_WITH_MARK,          /* stream was finished with end mark. */
+  LZMA_STATUS_NOT_FINISHED,                /* stream was not finished */
+  LZMA_STATUS_NEEDS_MORE_INPUT,            /* you must provide more input bytes */
+  LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK  /* there is probability that stream was finished without end mark */
+} ELzmaStatus;
+
+/* ELzmaStatus is used only as output value for function call */
+
+/* ---------- One Call Interface ---------- */
+
+/* LzmaDecode
+
+finishMode:
+  It has meaning only if the decoding reaches output limit (*destLen).
+  LZMA_FINISH_ANY - Decode just destLen bytes.
+  LZMA_FINISH_END - Stream must be finished after (*destLen).
+
+Returns:
+  SZ_OK
+    status:
+      LZMA_STATUS_FINISHED_WITH_MARK
+      LZMA_STATUS_NOT_FINISHED
+      LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK
+  SZ_ERROR_DATA - Data error
+  SZ_ERROR_MEM  - Memory allocation error
+  SZ_ERROR_UNSUPPORTED - Unsupported properties
+  SZ_ERROR_INPUT_EOF - It needs more bytes in input buffer (src).
+*/
+
+SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
+    const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,
+    ELzmaStatus *status, ISzAlloc *alloc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- /dev/null
+++ b/include/linux/lzma/LzmaEnc.h
@@ -0,0 +1,60 @@
+/*  LzmaEnc.h -- LZMA Encoder
+2009-02-07 : Igor Pavlov : Public domain */
+
+#ifndef __LZMA_ENC_H
+#define __LZMA_ENC_H
+
+#include "Types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LZMA_PROPS_SIZE 5
+
+typedef struct _CLzmaEncProps
+{
+  int level;       /*  0 <= level <= 9 */
+  UInt32 dictSize; /* (1 << 12) <= dictSize <= (1 << 27) for 32-bit version
+                      (1 << 12) <= dictSize <= (1 << 30) for 64-bit version
+                       default = (1 << 24) */
+  int lc;          /* 0 <= lc <= 8, default = 3 */
+  int lp;          /* 0 <= lp <= 4, default = 0 */
+  int pb;          /* 0 <= pb <= 4, default = 2 */
+  int algo;        /* 0 - fast, 1 - normal, default = 1 */
+  int fb;          /* 5 <= fb <= 273, default = 32 */
+  int btMode;      /* 0 - hashChain Mode, 1 - binTree mode - normal, default = 1 */
+  int numHashBytes; /* 2, 3 or 4, default = 4 */
+  UInt32 mc;        /* 1 <= mc <= (1 << 30), default = 32 */
+  unsigned writeEndMark;  /* 0 - do not write EOPM, 1 - write EOPM, default = 0 */
+  int numThreads;  /* 1 or 2, default = 2 */
+} CLzmaEncProps;
+
+void LzmaEncProps_Init(CLzmaEncProps *p);
+
+/* ---------- CLzmaEncHandle Interface ---------- */
+
+/* LzmaEnc_* functions can return the following exit codes:
+Returns:
+  SZ_OK           - OK
+  SZ_ERROR_MEM    - Memory allocation error
+  SZ_ERROR_PARAM  - Incorrect paramater in props
+  SZ_ERROR_WRITE  - Write callback error.
+  SZ_ERROR_PROGRESS - some break from progress callback
+  SZ_ERROR_THREAD - errors in multithreading functions (only for Mt version)
+*/
+
+typedef void * CLzmaEncHandle;
+
+CLzmaEncHandle LzmaEnc_Create(ISzAlloc *alloc);
+void LzmaEnc_Destroy(CLzmaEncHandle p, ISzAlloc *alloc, ISzAlloc *allocBig);
+SRes LzmaEnc_SetProps(CLzmaEncHandle p, const CLzmaEncProps *props);
+SRes LzmaEnc_WriteProperties(CLzmaEncHandle p, Byte *properties, SizeT *size);
+SRes LzmaEnc_MemEncode(CLzmaEncHandle p, Byte *dest, SizeT *destLen, const Byte *src, SizeT srcLen,
+    int writeEndMark, ICompressProgress *progress, ISzAlloc *alloc, ISzAlloc *allocBig);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--- /dev/null
+++ b/include/linux/lzma/Types.h
@@ -0,0 +1,226 @@
+/* Types.h -- Basic types
+2009-11-23 : Igor Pavlov : Public domain */
+
+#ifndef __7Z_TYPES_H
+#define __7Z_TYPES_H
+
+#include <stddef.h>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#ifndef EXTERN_C_BEGIN
+#ifdef __cplusplus
+#define EXTERN_C_BEGIN extern "C" {
+#define EXTERN_C_END }
+#else
+#define EXTERN_C_BEGIN
+#define EXTERN_C_END
+#endif
+#endif
+
+EXTERN_C_BEGIN
+
+#define SZ_OK 0
+
+#define SZ_ERROR_DATA 1
+#define SZ_ERROR_MEM 2
+#define SZ_ERROR_CRC 3
+#define SZ_ERROR_UNSUPPORTED 4
+#define SZ_ERROR_PARAM 5
+#define SZ_ERROR_INPUT_EOF 6
+#define SZ_ERROR_OUTPUT_EOF 7
+#define SZ_ERROR_READ 8
+#define SZ_ERROR_WRITE 9
+#define SZ_ERROR_PROGRESS 10
+#define SZ_ERROR_FAIL 11
+#define SZ_ERROR_THREAD 12
+
+#define SZ_ERROR_ARCHIVE 16
+#define SZ_ERROR_NO_ARCHIVE 17
+
+typedef int SRes;
+
+#ifdef _WIN32
+typedef DWORD WRes;
+#else
+typedef int WRes;
+#endif
+
+#ifndef RINOK
+#define RINOK(x) { int __result__ = (x); if (__result__ != 0) return __result__; }
+#endif
+
+typedef unsigned char Byte;
+typedef short Int16;
+typedef unsigned short UInt16;
+
+#ifdef _LZMA_UINT32_IS_ULONG
+typedef long Int32;
+typedef unsigned long UInt32;
+#else
+typedef int Int32;
+typedef unsigned int UInt32;
+#endif
+
+#ifdef _SZ_NO_INT_64
+
+/* define _SZ_NO_INT_64, if your compiler doesn't support 64-bit integers.
+   NOTES: Some code will work incorrectly in that case! */
+
+typedef long Int64;
+typedef unsigned long UInt64;
+
+#else
+
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+typedef __int64 Int64;
+typedef unsigned __int64 UInt64;
+#else
+typedef long long int Int64;
+typedef unsigned long long int UInt64;
+#endif
+
+#endif
+
+#ifdef _LZMA_NO_SYSTEM_SIZE_T
+typedef UInt32 SizeT;
+#else
+typedef size_t SizeT;
+#endif
+
+typedef int Bool;
+#define True 1
+#define False 0
+
+
+#ifdef _WIN32
+#define MY_STD_CALL __stdcall
+#else
+#define MY_STD_CALL
+#endif
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1300
+#define MY_NO_INLINE __declspec(noinline)
+#else
+#define MY_NO_INLINE
+#endif
+
+#define MY_CDECL __cdecl
+#define MY_FAST_CALL __fastcall
+
+#else
+
+#define MY_CDECL
+#define MY_FAST_CALL
+
+#endif
+
+
+/* The following interfaces use first parameter as pointer to structure */
+
+typedef struct
+{
+  SRes (*Read)(void *p, void *buf, size_t *size);
+    /* if (input(*size) != 0 && output(*size) == 0) means end_of_stream.
+       (output(*size) < input(*size)) is allowed */
+} ISeqInStream;
+
+/* it can return SZ_ERROR_INPUT_EOF */
+SRes SeqInStream_Read(ISeqInStream *stream, void *buf, size_t size);
+SRes SeqInStream_Read2(ISeqInStream *stream, void *buf, size_t size, SRes errorType);
+SRes SeqInStream_ReadByte(ISeqInStream *stream, Byte *buf);
+
+typedef struct
+{
+  size_t (*Write)(void *p, const void *buf, size_t size);
+    /* Returns: result - the number of actually written bytes.
+       (result < size) means error */
+} ISeqOutStream;
+
+typedef enum
+{
+  SZ_SEEK_SET = 0,
+  SZ_SEEK_CUR = 1,
+  SZ_SEEK_END = 2
+} ESzSeek;
+
+typedef struct
+{
+  SRes (*Read)(void *p, void *buf, size_t *size);  /* same as ISeqInStream::Read */
+  SRes (*Seek)(void *p, Int64 *pos, ESzSeek origin);
+} ISeekInStream;
+
+typedef struct
+{
+  SRes (*Look)(void *p, void **buf, size_t *size);
+    /* if (input(*size) != 0 && output(*size) == 0) means end_of_stream.
+       (output(*size) > input(*size)) is not allowed
+       (output(*size) < input(*size)) is allowed */
+  SRes (*Skip)(void *p, size_t offset);
+    /* offset must be <= output(*size) of Look */
+
+  SRes (*Read)(void *p, void *buf, size_t *size);
+    /* reads directly (without buffer). It's same as ISeqInStream::Read */
+  SRes (*Seek)(void *p, Int64 *pos, ESzSeek origin);
+} ILookInStream;
+
+SRes LookInStream_LookRead(ILookInStream *stream, void *buf, size_t *size);
+SRes LookInStream_SeekTo(ILookInStream *stream, UInt64 offset);
+
+/* reads via ILookInStream::Read */
+SRes LookInStream_Read2(ILookInStream *stream, void *buf, size_t size, SRes errorType);
+SRes LookInStream_Read(ILookInStream *stream, void *buf, size_t size);
+
+#define LookToRead_BUF_SIZE (1 << 14)
+
+typedef struct
+{
+  ILookInStream s;
+  ISeekInStream *realStream;
+  size_t pos;
+  size_t size;
+  Byte buf[LookToRead_BUF_SIZE];
+} CLookToRead;
+
+void LookToRead_CreateVTable(CLookToRead *p, int lookahead);
+void LookToRead_Init(CLookToRead *p);
+
+typedef struct
+{
+  ISeqInStream s;
+  ILookInStream *realStream;
+} CSecToLook;
+
+void SecToLook_CreateVTable(CSecToLook *p);
+
+typedef struct
+{
+  ISeqInStream s;
+  ILookInStream *realStream;
+} CSecToRead;
+
+void SecToRead_CreateVTable(CSecToRead *p);
+
+typedef struct
+{
+  SRes (*Progress)(void *p, UInt64 inSize, UInt64 outSize);
+    /* Returns: result. (result != SZ_OK) means break.
+       Value (UInt64)(Int64)-1 for size means unknown value. */
+} ICompressProgress;
+
+typedef struct
+{
+  void *(*Alloc)(void *p, size_t size);
+  void (*Free)(void *p, void *address); /* address can be 0 */
+} ISzAlloc;
+
+#define IAlloc_Alloc(p, size) (p)->Alloc((p), size)
+#define IAlloc_Free(p, a) (p)->Free((p), a)
+
+EXTERN_C_END
+
+#endif
--- a/include/uapi/linux/jffs2.h
+++ b/include/uapi/linux/jffs2.h
@@ -46,6 +46,7 @@
 #define JFFS2_COMPR_DYNRUBIN	0x05
 #define JFFS2_COMPR_ZLIB	0x06
 #define JFFS2_COMPR_LZO		0x07
+#define JFFS2_COMPR_LZMA	0x08
 /* Compatibility flags. */
 #define JFFS2_COMPAT_MASK 0xc000      /* What do to if an unknown nodetype is found */
 #define JFFS2_NODE_ACCURATE 0x2000
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -340,6 +340,12 @@ config ZSTD_DECOMPRESS
 
 source "lib/xz/Kconfig"
 
+config LZMA_COMPRESS
+    tristate
+
+config LZMA_DECOMPRESS
+    tristate
+
 #
 # These all provide a common interface (hence the apparent duplication with
 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -135,6 +135,16 @@ CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
 endif
 
+ifdef CONFIG_JFFS2_ZLIB
+  CONFIG_ZLIB_INFLATE:=y
+  CONFIG_ZLIB_DEFLATE:=y
+endif
+
+ifdef CONFIG_JFFS2_LZMA
+  CONFIG_LZMA_DECOMPRESS:=y
+  CONFIG_LZMA_COMPRESS:=y
+endif
+
 obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o
 CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
 
@@ -192,6 +202,8 @@ obj-$(CONFIG_ZSTD_COMPRESS) += zstd/
 obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd/
 obj-$(CONFIG_XZ_DEC) += xz/
 obj-$(CONFIG_RAID6_PQ) += raid6/
+obj-$(CONFIG_LZMA_COMPRESS) += lzma/
+obj-$(CONFIG_LZMA_DECOMPRESS) += lzma/
 
 lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
 lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
--- /dev/null
+++ b/lib/lzma/LzFind.c
@@ -0,0 +1,522 @@
+/* LzFind.c -- Match finder for LZ algorithms
+2009-04-22 : Igor Pavlov : Public domain */
+
+#include <string.h>
+
+#include "LzFind.h"
+#include "LzHash.h"
+
+#define kEmptyHashValue 0
+#define kMaxValForNormalize ((UInt32)0xFFFFFFFF)
+#define kNormalizeStepMin (1 << 10) /* it must be power of 2 */
+#define kNormalizeMask (~(kNormalizeStepMin - 1))
+#define kMaxHistorySize ((UInt32)3 << 30)
+
+#define kStartMaxLen 3
+
+#if 0
+#define DIRECT_INPUT	p->directInput
+#else
+#define DIRECT_INPUT	1
+#endif
+
+static void LzInWindow_Free(CMatchFinder *p, ISzAlloc *alloc)
+{
+  if (!DIRECT_INPUT)
+  {
+    alloc->Free(alloc, p->bufferBase);
+    p->bufferBase = 0;
+  }
+}
+
+/* keepSizeBefore + keepSizeAfter + keepSizeReserv must be < 4G) */
+
+static int LzInWindow_Create(CMatchFinder *p, UInt32 keepSizeReserv, ISzAlloc *alloc)
+{
+  UInt32 blockSize = p->keepSizeBefore + p->keepSizeAfter + keepSizeReserv;
+  if (DIRECT_INPUT)
+  {
+    p->blockSize = blockSize;
+    return 1;
+  }
+  if (p->bufferBase == 0 || p->blockSize != blockSize)
+  {
+    LzInWindow_Free(p, alloc);
+    p->blockSize = blockSize;
+    p->bufferBase = (Byte *)alloc->Alloc(alloc, (size_t)blockSize);
+  }
+  return (p->bufferBase != 0);
+}
+
+static Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p) { return p->buffer; }
+static Byte MatchFinder_GetIndexByte(CMatchFinder *p, Int32 index) { return p->buffer[index]; }
+
+static UInt32 MatchFinder_GetNumAvailableBytes(CMatchFinder *p) { return p->streamPos - p->pos; }
+
+static void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue)
+{
+  p->posLimit -= subValue;
+  p->pos -= subValue;
+  p->streamPos -= subValue;
+}
+
+static void MatchFinder_ReadBlock(CMatchFinder *p)
+{
+  if (p->streamEndWasReached || p->result != SZ_OK)
+    return;
+  if (DIRECT_INPUT)
+  {
+    UInt32 curSize = 0xFFFFFFFF - p->streamPos;
+    if (curSize > p->directInputRem)
+      curSize = (UInt32)p->directInputRem;
+    p->directInputRem -= curSize;
+    p->streamPos += curSize;
+    if (p->directInputRem == 0)
+      p->streamEndWasReached = 1;
+    return;
+  }
+  for (;;)
+  {
+    Byte *dest = p->buffer + (p->streamPos - p->pos);
+    size_t size = (p->bufferBase + p->blockSize - dest);
+    if (size == 0)
+      return;
+    p->result = p->stream->Read(p->stream, dest, &size);
+    if (p->result != SZ_OK)
+      return;
+    if (size == 0)
+    {
+      p->streamEndWasReached = 1;
+      return;
+    }
+    p->streamPos += (UInt32)size;
+    if (p->streamPos - p->pos > p->keepSizeAfter)
+      return;
+  }
+}
+
+static void MatchFinder_MoveBlock(CMatchFinder *p)
+{
+  memmove(p->bufferBase,
+    p->buffer - p->keepSizeBefore,
+    (size_t)(p->streamPos - p->pos + p->keepSizeBefore));
+  p->buffer = p->bufferBase + p->keepSizeBefore;
+}
+
+static int MatchFinder_NeedMove(CMatchFinder *p)
+{
+  if (DIRECT_INPUT)
+    return 0;
+  /* if (p->streamEndWasReached) return 0; */
+  return ((size_t)(p->bufferBase + p->blockSize - p->buffer) <= p->keepSizeAfter);
+}
+
+static void MatchFinder_CheckAndMoveAndRead(CMatchFinder *p)
+{
+  if (MatchFinder_NeedMove(p))
+    MatchFinder_MoveBlock(p);
+  MatchFinder_ReadBlock(p);
+}
+
+static void MatchFinder_SetDefaultSettings(CMatchFinder *p)
+{
+  p->cutValue = 32;
+  p->btMode = 1;
+  p->numHashBytes = 4;
+  p->bigHash = 0;
+}
+
+#define kCrcPoly 0xEDB88320
+
+void MatchFinder_Construct(CMatchFinder *p)
+{
+  UInt32 i;
+  p->bufferBase = 0;
+  p->directInput = 0;
+  p->hash = 0;
+  MatchFinder_SetDefaultSettings(p);
+
+  for (i = 0; i < 256; i++)
+  {
+    UInt32 r = i;
+    int j;
+    for (j = 0; j < 8; j++)
+      r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
+    p->crc[i] = r;
+  }
+}
+
+static void MatchFinder_FreeThisClassMemory(CMatchFinder *p, ISzAlloc *alloc)
+{
+  alloc->Free(alloc, p->hash);
+  p->hash = 0;
+}
+
+void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc)
+{
+  MatchFinder_FreeThisClassMemory(p, alloc);
+  LzInWindow_Free(p, alloc);
+}
+
+static CLzRef* AllocRefs(UInt32 num, ISzAlloc *alloc)
+{
+  size_t sizeInBytes = (size_t)num * sizeof(CLzRef);
+  if (sizeInBytes / sizeof(CLzRef) != num)
+    return 0;
+  return (CLzRef *)alloc->Alloc(alloc, sizeInBytes);
+}
+
+int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
+    UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
+    ISzAlloc *alloc)
+{
+  UInt32 sizeReserv;
+  if (historySize > kMaxHistorySize)
+  {
+    MatchFinder_Free(p, alloc);
+    return 0;
+  }
+  sizeReserv = historySize >> 1;
+  if (historySize > ((UInt32)2 << 30))
+    sizeReserv = historySize >> 2;
+  sizeReserv += (keepAddBufferBefore + matchMaxLen + keepAddBufferAfter) / 2 + (1 << 19);
+
+  p->keepSizeBefore = historySize + keepAddBufferBefore + 1;
+  p->keepSizeAfter = matchMaxLen + keepAddBufferAfter;
+  /* we need one additional byte, since we use MoveBlock after pos++ and before dictionary using */
+  if (LzInWindow_Create(p, sizeReserv, alloc))
+  {
+    UInt32 newCyclicBufferSize = historySize + 1;
+    UInt32 hs;
+    p->matchMaxLen = matchMaxLen;
+    {
+      p->fixedHashSize = 0;
+      if (p->numHashBytes == 2)
+        hs = (1 << 16) - 1;
+      else
+      {
+        hs = historySize - 1;
+        hs |= (hs >> 1);
+        hs |= (hs >> 2);
+        hs |= (hs >> 4);
+        hs |= (hs >> 8);
+        hs >>= 1;
+        hs |= 0xFFFF; /* don't change it! It's required for Deflate */
+        if (hs > (1 << 24))
+        {
+          if (p->numHashBytes == 3)
+            hs = (1 << 24) - 1;
+          else
+            hs >>= 1;
+        }
+      }
+      p->hashMask = hs;
+      hs++;
+      if (p->numHashBytes > 2) p->fixedHashSize += kHash2Size;
+      if (p->numHashBytes > 3) p->fixedHashSize += kHash3Size;
+      if (p->numHashBytes > 4) p->fixedHashSize += kHash4Size;
+      hs += p->fixedHashSize;
+    }
+
+    {
+      UInt32 prevSize = p->hashSizeSum + p->numSons;
+      UInt32 newSize;
+      p->historySize = historySize;
+      p->hashSizeSum = hs;
+      p->cyclicBufferSize = newCyclicBufferSize;
+      p->numSons = (p->btMode ? newCyclicBufferSize * 2 : newCyclicBufferSize);
+      newSize = p->hashSizeSum + p->numSons;
+      if (p->hash != 0 && prevSize == newSize)
+        return 1;
+      MatchFinder_FreeThisClassMemory(p, alloc);
+      p->hash = AllocRefs(newSize, alloc);
+      if (p->hash != 0)
+      {
+        p->son = p->hash + p->hashSizeSum;
+        return 1;
+      }
+    }
+  }
+  MatchFinder_Free(p, alloc);
+  return 0;
+}
+
+static void MatchFinder_SetLimits(CMatchFinder *p)
+{
+  UInt32 limit = kMaxValForNormalize - p->pos;
+  UInt32 limit2 = p->cyclicBufferSize - p->cyclicBufferPos;
+  if (limit2 < limit)
+    limit = limit2;
+  limit2 = p->streamPos - p->pos;
+  if (limit2 <= p->keepSizeAfter)
+  {
+    if (limit2 > 0)
+      limit2 = 1;
+  }
+  else
+    limit2 -= p->keepSizeAfter;
+  if (limit2 < limit)
+    limit = limit2;
+  {
+    UInt32 lenLimit = p->streamPos - p->pos;
+    if (lenLimit > p->matchMaxLen)
+      lenLimit = p->matchMaxLen;
+    p->lenLimit = lenLimit;
+  }
+  p->posLimit = p->pos + limit;
+}
+
+static void MatchFinder_Init(CMatchFinder *p)
+{
+  UInt32 i;
+  for (i = 0; i < p->hashSizeSum; i++)
+    p->hash[i] = kEmptyHashValue;
+  p->cyclicBufferPos = 0;
+  p->buffer = p->bufferBase;
+  p->pos = p->streamPos = p->cyclicBufferSize;
+  p->result = SZ_OK;
+  p->streamEndWasReached = 0;
+  MatchFinder_ReadBlock(p);
+  MatchFinder_SetLimits(p);
+}
+
+static UInt32 MatchFinder_GetSubValue(CMatchFinder *p)
+{
+  return (p->pos - p->historySize - 1) & kNormalizeMask;
+}
+
+static void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, UInt32 numItems)
+{
+  UInt32 i;
+  for (i = 0; i < numItems; i++)
+  {
+    UInt32 value = items[i];
+    if (value <= subValue)
+      value = kEmptyHashValue;
+    else
+      value -= subValue;
+    items[i] = value;
+  }
+}
+
+static void MatchFinder_Normalize(CMatchFinder *p)
+{
+  UInt32 subValue = MatchFinder_GetSubValue(p);
+  MatchFinder_Normalize3(subValue, p->hash, p->hashSizeSum + p->numSons);
+  MatchFinder_ReduceOffsets(p, subValue);
+}
+
+static void MatchFinder_CheckLimits(CMatchFinder *p)
+{
+  if (p->pos == kMaxValForNormalize)
+    MatchFinder_Normalize(p);
+  if (!p->streamEndWasReached && p->keepSizeAfter == p->streamPos - p->pos)
+    MatchFinder_CheckAndMoveAndRead(p);
+  if (p->cyclicBufferPos == p->cyclicBufferSize)
+    p->cyclicBufferPos = 0;
+  MatchFinder_SetLimits(p);
+}
+
+static UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
+    UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue,
+    UInt32 *distances, UInt32 maxLen)
+{
+  CLzRef *ptr0 = son + (_cyclicBufferPos << 1) + 1;
+  CLzRef *ptr1 = son + (_cyclicBufferPos << 1);
+  UInt32 len0 = 0, len1 = 0;
+  for (;;)
+  {
+    UInt32 delta = pos - curMatch;
+    if (cutValue-- == 0 || delta >= _cyclicBufferSize)
+    {
+      *ptr0 = *ptr1 = kEmptyHashValue;
+      return distances;
+    }
+    {
+      CLzRef *pair = son + ((_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)) << 1);
+      const Byte *pb = cur - delta;
+      UInt32 len = (len0 < len1 ? len0 : len1);
+      if (pb[len] == cur[len])
+      {
+        if (++len != lenLimit && pb[len] == cur[len])
+          while (++len != lenLimit)
+            if (pb[len] != cur[len])
+              break;
+        if (maxLen < len)
+        {
+          *distances++ = maxLen = len;
+          *distances++ = delta - 1;
+          if (len == lenLimit)
+          {
+            *ptr1 = pair[0];
+            *ptr0 = pair[1];
+            return distances;
+          }
+        }
+      }
+      if (pb[len] < cur[len])
+      {
+        *ptr1 = curMatch;
+        ptr1 = pair + 1;
+        curMatch = *ptr1;
+        len1 = len;
+      }
+      else
+      {
+        *ptr0 = curMatch;
+        ptr0 = pair;
+        curMatch = *ptr0;
+        len0 = len;
+      }
+    }
+  }
+}
+
+static void SkipMatchesSpec(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *cur, CLzRef *son,
+    UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 cutValue)
+{
+  CLzRef *ptr0 = son + (_cyclicBufferPos << 1) + 1;
+  CLzRef *ptr1 = son + (_cyclicBufferPos << 1);
+  UInt32 len0 = 0, len1 = 0;
+  for (;;)
+  {
+    UInt32 delta = pos - curMatch;
+    if (cutValue-- == 0 || delta >= _cyclicBufferSize)
+    {
+      *ptr0 = *ptr1 = kEmptyHashValue;
+      return;
+    }
+    {
+      CLzRef *pair = son + ((_cyclicBufferPos - delta + ((delta > _cyclicBufferPos) ? _cyclicBufferSize : 0)) << 1);
+      const Byte *pb = cur - delta;
+      UInt32 len = (len0 < len1 ? len0 : len1);
+      if (pb[len] == cur[len])
+      {
+        while (++len != lenLimit)
+          if (pb[len] != cur[len])
+            break;
+        {
+          if (len == lenLimit)
+          {
+            *ptr1 = pair[0];
+            *ptr0 = pair[1];
+            return;
+          }
+        }
+      }
+      if (pb[len] < cur[len])
+      {
+        *ptr1 = curMatch;
+        ptr1 = pair + 1;
+        curMatch = *ptr1;
+        len1 = len;
+      }
+      else
+      {
+        *ptr0 = curMatch;
+        ptr0 = pair;
+        curMatch = *ptr0;
+        len0 = len;
+      }
+    }
+  }
+}
+
+#define MOVE_POS \
+  ++p->cyclicBufferPos; \
+  p->buffer++; \
+  if (++p->pos == p->posLimit) MatchFinder_CheckLimits(p);
+
+static void MatchFinder_MovePos(CMatchFinder *p) { MOVE_POS; }
+
+#define MOVE_POS_RET MatchFinder_MovePos(p); return offset;
+
+#define GET_MATCHES_HEADER2(minLen, ret_op) \
+  UInt32 lenLimit; UInt32 hashValue; const Byte *cur; UInt32 curMatch; \
+  lenLimit = p->lenLimit; { if (lenLimit < minLen) { MatchFinder_MovePos(p); ret_op; }} \
+  cur = p->buffer;
+
+#define GET_MATCHES_HEADER(minLen) GET_MATCHES_HEADER2(minLen, return 0)
+#define SKIP_HEADER(minLen)        GET_MATCHES_HEADER2(minLen, continue)
+
+#define MF_PARAMS(p) p->pos, p->buffer, p->son, p->cyclicBufferPos, p->cyclicBufferSize, p->cutValue
+
+#define GET_MATCHES_FOOTER(offset, maxLen) \
+  offset = (UInt32)(GetMatchesSpec1(lenLimit, curMatch, MF_PARAMS(p), \
+  distances + offset, maxLen) - distances); MOVE_POS_RET;
+
+#define SKIP_FOOTER \
+  SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p)); MatchFinder_MovePos(p);
+
+static UInt32 Bt4_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances)
+{
+  UInt32 hash2Value, hash3Value, delta2, delta3, maxLen, offset;
+  GET_MATCHES_HEADER(4)
+
+  HASH4_CALC;
+
+  delta2 = p->pos - p->hash[                hash2Value];
+  delta3 = p->pos - p->hash[kFix3HashSize + hash3Value];
+  curMatch = p->hash[kFix4HashSize + hashValue];
+
+  p->hash[                hash2Value] =
+  p->hash[kFix3HashSize + hash3Value] =
+  p->hash[kFix4HashSize + hashValue] = p->pos;
+
+  maxLen = 1;
+  offset = 0;
+  if (delta2 < p->cyclicBufferSize && *(cur - delta2) == *cur)
+  {
+    distances[0] = maxLen = 2;
+    distances[1] = delta2 - 1;
+    offset = 2;
+  }
+  if (delta2 != delta3 && delta3 < p->cyclicBufferSize && *(cur - delta3) == *cur)
+  {
+    maxLen = 3;
+    distances[offset + 1] = delta3 - 1;
+    offset += 2;
+    delta2 = delta3;
+  }
+  if (offset != 0)
+  {
+    for (; maxLen != lenLimit; maxLen++)
+      if (cur[(ptrdiff_t)maxLen - delta2] != cur[maxLen])
+        break;
+    distances[offset - 2] = maxLen;
+    if (maxLen == lenLimit)
+    {
+      SkipMatchesSpec(lenLimit, curMatch, MF_PARAMS(p));
+      MOVE_POS_RET;
+    }
+  }
+  if (maxLen < 3)
+    maxLen = 3;
+  GET_MATCHES_FOOTER(offset, maxLen)
+}
+
+static void Bt4_MatchFinder_Skip(CMatchFinder *p, UInt32 num)
+{
+  do
+  {
+    UInt32 hash2Value, hash3Value;
+    SKIP_HEADER(4)
+    HASH4_CALC;
+    curMatch = p->hash[kFix4HashSize + hashValue];
+    p->hash[                hash2Value] =
+    p->hash[kFix3HashSize + hash3Value] = p->pos;
+    p->hash[kFix4HashSize + hashValue] = p->pos;
+    SKIP_FOOTER
+  }
+  while (--num != 0);
+}
+
+void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable)
+{
+  vTable->Init = (Mf_Init_Func)MatchFinder_Init;
+  vTable->GetIndexByte = (Mf_GetIndexByte_Func)MatchFinder_GetIndexByte;
+  vTable->GetNumAvailableBytes = (Mf_GetNumAvailableBytes_Func)MatchFinder_GetNumAvailableBytes;
+  vTable->GetPointerToCurrentPos = (Mf_GetPointerToCurrentPos_Func)MatchFinder_GetPointerToCurrentPos;
+  vTable->GetMatches = (Mf_GetMatches_Func)Bt4_MatchFinder_GetMatches;
+  vTable->Skip = (Mf_Skip_Func)Bt4_MatchFinder_Skip;
+}
--- /dev/null
+++ b/lib/lzma/LzmaDec.c
@@ -0,0 +1,925 @@
+/* LzmaDec.c -- LZMA Decoder
+2009-09-20 : Igor Pavlov : Public domain */
+
+#include "LzmaDec.h"
+
+#include <string.h>
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+
+#define RC_INIT_SIZE 5
+
+#define NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }
+
+#define IF_BIT_0(p) ttt = *(p); NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
+#define UPDATE_0(p) range = bound; *(p) = (CLzmaProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
+#define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CLzmaProb)(ttt - (ttt >> kNumMoveBits));
+#define GET_BIT2(p, i, A0, A1) IF_BIT_0(p) \
+  { UPDATE_0(p); i = (i + i); A0; } else \
+  { UPDATE_1(p); i = (i + i) + 1; A1; }
+#define GET_BIT(p, i) GET_BIT2(p, i, ; , ;)
+
+#define TREE_GET_BIT(probs, i) { GET_BIT((probs + i), i); }
+#define TREE_DECODE(probs, limit, i) \
+  { i = 1; do { TREE_GET_BIT(probs, i); } while (i < limit); i -= limit; }
+
+/* #define _LZMA_SIZE_OPT */
+
+#ifdef _LZMA_SIZE_OPT
+#define TREE_6_DECODE(probs, i) TREE_DECODE(probs, (1 << 6), i)
+#else
+#define TREE_6_DECODE(probs, i) \
+  { i = 1; \
+  TREE_GET_BIT(probs, i); \
+  TREE_GET_BIT(probs, i); \
+  TREE_GET_BIT(probs, i); \
+  TREE_GET_BIT(probs, i); \
+  TREE_GET_BIT(probs, i); \
+  TREE_GET_BIT(probs, i); \
+  i -= 0x40; }
+#endif
+
+#define NORMALIZE_CHECK if (range < kTopValue) { if (buf >= bufLimit) return DUMMY_ERROR; range <<= 8; code = (code << 8) | (*buf++); }
+
+#define IF_BIT_0_CHECK(p) ttt = *(p); NORMALIZE_CHECK; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
+#define UPDATE_0_CHECK range = bound;
+#define UPDATE_1_CHECK range -= bound; code -= bound;
+#define GET_BIT2_CHECK(p, i, A0, A1) IF_BIT_0_CHECK(p) \
+  { UPDATE_0_CHECK; i = (i + i); A0; } else \
+  { UPDATE_1_CHECK; i = (i + i) + 1; A1; }
+#define GET_BIT_CHECK(p, i) GET_BIT2_CHECK(p, i, ; , ;)
+#define TREE_DECODE_CHECK(probs, limit, i) \
+  { i = 1; do { GET_BIT_CHECK(probs + i, i) } while (i < limit); i -= limit; }
+
+
+#define kNumPosBitsMax 4
+#define kNumPosStatesMax (1 << kNumPosBitsMax)
+
+#define kLenNumLowBits 3
+#define kLenNumLowSymbols (1 << kLenNumLowBits)
+#define kLenNumMidBits 3
+#define kLenNumMidSymbols (1 << kLenNumMidBits)
+#define kLenNumHighBits 8
+#define kLenNumHighSymbols (1 << kLenNumHighBits)
+
+#define LenChoice 0
+#define LenChoice2 (LenChoice + 1)
+#define LenLow (LenChoice2 + 1)
+#define LenMid (LenLow + (kNumPosStatesMax << kLenNumLowBits))
+#define LenHigh (LenMid + (kNumPosStatesMax << kLenNumMidBits))
+#define kNumLenProbs (LenHigh + kLenNumHighSymbols)
+
+
+#define kNumStates 12
+#define kNumLitStates 7
+
+#define kStartPosModelIndex 4
+#define kEndPosModelIndex 14
+#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
+
+#define kNumPosSlotBits 6
+#define kNumLenToPosStates 4
+
+#define kNumAlignBits 4
+#define kAlignTableSize (1 << kNumAlignBits)
+
+#define kMatchMinLen 2
+#define kMatchSpecLenStart (kMatchMinLen + kLenNumLowSymbols + kLenNumMidSymbols + kLenNumHighSymbols)
+
+#define IsMatch 0
+#define IsRep (IsMatch + (kNumStates << kNumPosBitsMax))
+#define IsRepG0 (IsRep + kNumStates)
+#define IsRepG1 (IsRepG0 + kNumStates)
+#define IsRepG2 (IsRepG1 + kNumStates)
+#define IsRep0Long (IsRepG2 + kNumStates)
+#define PosSlot (IsRep0Long + (kNumStates << kNumPosBitsMax))
+#define SpecPos (PosSlot + (kNumLenToPosStates << kNumPosSlotBits))
+#define Align (SpecPos + kNumFullDistances - kEndPosModelIndex)
+#define LenCoder (Align + kAlignTableSize)
+#define RepLenCoder (LenCoder + kNumLenProbs)
+#define Literal (RepLenCoder + kNumLenProbs)
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LzmaProps_GetNumProbs(p) ((UInt32)LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((p)->lc + (p)->lp)))
+
+#if Literal != LZMA_BASE_SIZE
+StopCompilingDueBUG
+#endif
+
+#define LZMA_DIC_MIN (1 << 12)
+
+/* First LZMA-symbol is always decoded.
+And it decodes new LZMA-symbols while (buf < bufLimit), but "buf" is without last normalization
+Out:
+  Result:
+    SZ_OK - OK
+    SZ_ERROR_DATA - Error
+  p->remainLen:
+    < kMatchSpecLenStart : normal remain
+    = kMatchSpecLenStart : finished
+    = kMatchSpecLenStart + 1 : Flush marker
+    = kMatchSpecLenStart + 2 : State Init Marker
+*/
+
+static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
+{
+  CLzmaProb *probs = p->probs;
+
+  unsigned state = p->state;
+  UInt32 rep0 = p->reps[0], rep1 = p->reps[1], rep2 = p->reps[2], rep3 = p->reps[3];
+  unsigned pbMask = ((unsigned)1 << (p->prop.pb)) - 1;
+  unsigned lpMask = ((unsigned)1 << (p->prop.lp)) - 1;
+  unsigned lc = p->prop.lc;
+
+  Byte *dic = p->dic;
+  SizeT dicBufSize = p->dicBufSize;
+  SizeT dicPos = p->dicPos;
+
+  UInt32 processedPos = p->processedPos;
+  UInt32 checkDicSize = p->checkDicSize;
+  unsigned len = 0;
+
+  const Byte *buf = p->buf;
+  UInt32 range = p->range;
+  UInt32 code = p->code;
+
+  do
+  {
+    CLzmaProb *prob;
+    UInt32 bound;
+    unsigned ttt;
+    unsigned posState = processedPos & pbMask;
+
+    prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;
+    IF_BIT_0(prob)
+    {
+      unsigned symbol;
+      UPDATE_0(prob);
+      prob = probs + Literal;
+      if (checkDicSize != 0 || processedPos != 0)
+        prob += (LZMA_LIT_SIZE * (((processedPos & lpMask) << lc) +
+        (dic[(dicPos == 0 ? dicBufSize : dicPos) - 1] >> (8 - lc))));
+
+      if (state < kNumLitStates)
+      {
+        state -= (state < 4) ? state : 3;
+        symbol = 1;
+        do { GET_BIT(prob + symbol, symbol) } while (symbol < 0x100);
+      }
+      else
+      {
+        unsigned matchByte = p->dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+        unsigned offs = 0x100;
+        state -= (state < 10) ? 3 : 6;
+        symbol = 1;
+        do
+        {
+          unsigned bit;
+          CLzmaProb *probLit;
+          matchByte <<= 1;
+          bit = (matchByte & offs);
+          probLit = prob + offs + bit + symbol;
+          GET_BIT2(probLit, symbol, offs &= ~bit, offs &= bit)
+        }
+        while (symbol < 0x100);
+      }
+      dic[dicPos++] = (Byte)symbol;
+      processedPos++;
+      continue;
+    }
+    else
+    {
+      UPDATE_1(prob);
+      prob = probs + IsRep + state;
+      IF_BIT_0(prob)
+      {
+        UPDATE_0(prob);
+        state += kNumStates;
+        prob = probs + LenCoder;
+      }
+      else
+      {
+        UPDATE_1(prob);
+        if (checkDicSize == 0 && processedPos == 0)
+          return SZ_ERROR_DATA;
+        prob = probs + IsRepG0 + state;
+        IF_BIT_0(prob)
+        {
+          UPDATE_0(prob);
+          prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;
+          IF_BIT_0(prob)
+          {
+            UPDATE_0(prob);
+            dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+            dicPos++;
+            processedPos++;
+            state = state < kNumLitStates ? 9 : 11;
+            continue;
+          }
+          UPDATE_1(prob);
+        }
+        else
+        {
+          UInt32 distance;
+          UPDATE_1(prob);
+          prob = probs + IsRepG1 + state;
+          IF_BIT_0(prob)
+          {
+            UPDATE_0(prob);
+            distance = rep1;
+          }
+          else
+          {
+            UPDATE_1(prob);
+            prob = probs + IsRepG2 + state;
+            IF_BIT_0(prob)
+            {
+              UPDATE_0(prob);
+              distance = rep2;
+            }
+            else
+            {
+              UPDATE_1(prob);
+              distance = rep3;
+              rep3 = rep2;
+            }
+            rep2 = rep1;
+          }
+          rep1 = rep0;
+          rep0 = distance;
+        }
+        state = state < kNumLitStates ? 8 : 11;
+        prob = probs + RepLenCoder;
+      }
+      {
+        unsigned limit, offset;
+        CLzmaProb *probLen = prob + LenChoice;
+        IF_BIT_0(probLen)
+        {
+          UPDATE_0(probLen);
+          probLen = prob + LenLow + (posState << kLenNumLowBits);
+          offset = 0;
+          limit = (1 << kLenNumLowBits);
+        }
+        else
+        {
+          UPDATE_1(probLen);
+          probLen = prob + LenChoice2;
+          IF_BIT_0(probLen)
+          {
+            UPDATE_0(probLen);
+            probLen = prob + LenMid + (posState << kLenNumMidBits);
+            offset = kLenNumLowSymbols;
+            limit = (1 << kLenNumMidBits);
+          }
+          else
+          {
+            UPDATE_1(probLen);
+            probLen = prob + LenHigh;
+            offset = kLenNumLowSymbols + kLenNumMidSymbols;
+            limit = (1 << kLenNumHighBits);
+          }
+        }
+        TREE_DECODE(probLen, limit, len);
+        len += offset;
+      }
+
+      if (state >= kNumStates)
+      {
+        UInt32 distance;
+        prob = probs + PosSlot +
+            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) << kNumPosSlotBits);
+        TREE_6_DECODE(prob, distance);
+        if (distance >= kStartPosModelIndex)
+        {
+          unsigned posSlot = (unsigned)distance;
+          int numDirectBits = (int)(((distance >> 1) - 1));
+          distance = (2 | (distance & 1));
+          if (posSlot < kEndPosModelIndex)
+          {
+            distance <<= numDirectBits;
+            prob = probs + SpecPos + distance - posSlot - 1;
+            {
+              UInt32 mask = 1;
+              unsigned i = 1;
+              do
+              {
+                GET_BIT2(prob + i, i, ; , distance |= mask);
+                mask <<= 1;
+              }
+              while (--numDirectBits != 0);
+            }
+          }
+          else
+          {
+            numDirectBits -= kNumAlignBits;
+            do
+            {
+              NORMALIZE
+              range >>= 1;
+
+              {
+                UInt32 t;
+                code -= range;
+                t = (0 - ((UInt32)code >> 31)); /* (UInt32)((Int32)code >> 31) */
+                distance = (distance << 1) + (t + 1);
+                code += range & t;
+              }
+              /*
+              distance <<= 1;
+              if (code >= range)
+              {
+                code -= range;
+                distance |= 1;
+              }
+              */
+            }
+            while (--numDirectBits != 0);
+            prob = probs + Align;
+            distance <<= kNumAlignBits;
+            {
+              unsigned i = 1;
+              GET_BIT2(prob + i, i, ; , distance |= 1);
+              GET_BIT2(prob + i, i, ; , distance |= 2);
+              GET_BIT2(prob + i, i, ; , distance |= 4);
+              GET_BIT2(prob + i, i, ; , distance |= 8);
+            }
+            if (distance == (UInt32)0xFFFFFFFF)
+            {
+              len += kMatchSpecLenStart;
+              state -= kNumStates;
+              break;
+            }
+          }
+        }
+        rep3 = rep2;
+        rep2 = rep1;
+        rep1 = rep0;
+        rep0 = distance + 1;
+        if (checkDicSize == 0)
+        {
+          if (distance >= processedPos)
+            return SZ_ERROR_DATA;
+        }
+        else if (distance >= checkDicSize)
+          return SZ_ERROR_DATA;
+        state = (state < kNumStates + kNumLitStates) ? kNumLitStates : kNumLitStates + 3;
+      }
+
+      len += kMatchMinLen;
+
+      if (limit == dicPos)
+        return SZ_ERROR_DATA;
+      {
+        SizeT rem = limit - dicPos;
+        unsigned curLen = ((rem < len) ? (unsigned)rem : len);
+        SizeT pos = (dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0);
+
+        processedPos += curLen;
+
+        len -= curLen;
+        if (pos + curLen <= dicBufSize)
+        {
+          Byte *dest = dic + dicPos;
+          ptrdiff_t src = (ptrdiff_t)pos - (ptrdiff_t)dicPos;
+          const Byte *lim = dest + curLen;
+          dicPos += curLen;
+          do
+            *(dest) = (Byte)*(dest + src);
+          while (++dest != lim);
+        }
+        else
+        {
+          do
+          {
+            dic[dicPos++] = dic[pos];
+            if (++pos == dicBufSize)
+              pos = 0;
+          }
+          while (--curLen != 0);
+        }
+      }
+    }
+  }
+  while (dicPos < limit && buf < bufLimit);
+  NORMALIZE;
+  p->buf = buf;
+  p->range = range;
+  p->code = code;
+  p->remainLen = len;
+  p->dicPos = dicPos;
+  p->processedPos = processedPos;
+  p->reps[0] = rep0;
+  p->reps[1] = rep1;
+  p->reps[2] = rep2;
+  p->reps[3] = rep3;
+  p->state = state;
+
+  return SZ_OK;
+}
+
+static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, SizeT limit)
+{
+  if (p->remainLen != 0 && p->remainLen < kMatchSpecLenStart)
+  {
+    Byte *dic = p->dic;
+    SizeT dicPos = p->dicPos;
+    SizeT dicBufSize = p->dicBufSize;
+    unsigned len = p->remainLen;
+    UInt32 rep0 = p->reps[0];
+    if (limit - dicPos < len)
+      len = (unsigned)(limit - dicPos);
+
+    if (p->checkDicSize == 0 && p->prop.dicSize - p->processedPos <= len)
+      p->checkDicSize = p->prop.dicSize;
+
+    p->processedPos += len;
+    p->remainLen -= len;
+    while (len-- != 0)
+    {
+      dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
+      dicPos++;
+    }
+    p->dicPos = dicPos;
+  }
+}
+
+static int MY_FAST_CALL LzmaDec_DecodeReal2(CLzmaDec *p, SizeT limit, const Byte *bufLimit)
+{
+  do
+  {
+    SizeT limit2 = limit;
+    if (p->checkDicSize == 0)
+    {
+      UInt32 rem = p->prop.dicSize - p->processedPos;
+      if (limit - p->dicPos > rem)
+        limit2 = p->dicPos + rem;
+    }
+    RINOK(LzmaDec_DecodeReal(p, limit2, bufLimit));
+    if (p->processedPos >= p->prop.dicSize)
+      p->checkDicSize = p->prop.dicSize;
+    LzmaDec_WriteRem(p, limit);
+  }
+  while (p->dicPos < limit && p->buf < bufLimit && p->remainLen < kMatchSpecLenStart);
+
+  if (p->remainLen > kMatchSpecLenStart)
+  {
+    p->remainLen = kMatchSpecLenStart;
+  }
+  return 0;
+}
+
+typedef enum
+{
+  DUMMY_ERROR, /* unexpected end of input stream */
+  DUMMY_LIT,
+  DUMMY_MATCH,
+  DUMMY_REP
+} ELzmaDummy;
+
+static ELzmaDummy LzmaDec_TryDummy(const CLzmaDec *p, const Byte *buf, SizeT inSize)
+{
+  UInt32 range = p->range;
+  UInt32 code = p->code;
+  const Byte *bufLimit = buf + inSize;
+  CLzmaProb *probs = p->probs;
+  unsigned state = p->state;
+  ELzmaDummy res;
+
+  {
+    CLzmaProb *prob;
+    UInt32 bound;
+    unsigned ttt;
+    unsigned posState = (p->processedPos) & ((1 << p->prop.pb) - 1);
+
+    prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;
+    IF_BIT_0_CHECK(prob)
+    {
+      UPDATE_0_CHECK
+
+      /* if (bufLimit - buf >= 7) return DUMMY_LIT; */
+
+      prob = probs + Literal;
+      if (p->checkDicSize != 0 || p->processedPos != 0)
+        prob += (LZMA_LIT_SIZE *
+          ((((p->processedPos) & ((1 << (p->prop.lp)) - 1)) << p->prop.lc) +
+          (p->dic[(p->dicPos == 0 ? p->dicBufSize : p->dicPos) - 1] >> (8 - p->prop.lc))));
+
+      if (state < kNumLitStates)
+      {
+        unsigned symbol = 1;
+        do { GET_BIT_CHECK(prob + symbol, symbol) } while (symbol < 0x100);
+      }
+      else
+      {
+        unsigned matchByte = p->dic[p->dicPos - p->reps[0] +
+            ((p->dicPos < p->reps[0]) ? p->dicBufSize : 0)];
+        unsigned offs = 0x100;
+        unsigned symbol = 1;
+        do
+        {
+          unsigned bit;
+          CLzmaProb *probLit;
+          matchByte <<= 1;
+          bit = (matchByte & offs);
+          probLit = prob + offs + bit + symbol;
+          GET_BIT2_CHECK(probLit, symbol, offs &= ~bit, offs &= bit)
+        }
+        while (symbol < 0x100);
+      }
+      res = DUMMY_LIT;
+    }
+    else
+    {
+      unsigned len;
+      UPDATE_1_CHECK;
+
+      prob = probs + IsRep + state;
+      IF_BIT_0_CHECK(prob)
+      {
+        UPDATE_0_CHECK;
+        state = 0;
+        prob = probs + LenCoder;
+        res = DUMMY_MATCH;
+      }
+      else
+      {
+        UPDATE_1_CHECK;
+        res = DUMMY_REP;
+        prob = probs + IsRepG0 + state;
+        IF_BIT_0_CHECK(prob)
+        {
+          UPDATE_0_CHECK;
+          prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;
+          IF_BIT_0_CHECK(prob)
+          {
+            UPDATE_0_CHECK;
+            NORMALIZE_CHECK;
+            return DUMMY_REP;
+          }
+          else
+          {
+            UPDATE_1_CHECK;
+          }
+        }
+        else
+        {
+          UPDATE_1_CHECK;
+          prob = probs + IsRepG1 + state;
+          IF_BIT_0_CHECK(prob)
+          {
+            UPDATE_0_CHECK;
+          }
+          else
+          {
+            UPDATE_1_CHECK;
+            prob = probs + IsRepG2 + state;
+            IF_BIT_0_CHECK(prob)
+            {
+              UPDATE_0_CHECK;
+            }
+            else
+            {
+              UPDATE_1_CHECK;
+            }
+          }
+        }
+        state = kNumStates;
+        prob = probs + RepLenCoder;
+      }
+      {
+        unsigned limit, offset;
+        CLzmaProb *probLen = prob + LenChoice;
+        IF_BIT_0_CHECK(probLen)
+        {
+          UPDATE_0_CHECK;
+          probLen = prob + LenLow + (posState << kLenNumLowBits);
+          offset = 0;
+          limit = 1 << kLenNumLowBits;
+        }
+        else
+        {
+          UPDATE_1_CHECK;
+          probLen = prob + LenChoice2;
+          IF_BIT_0_CHECK(probLen)
+          {
+            UPDATE_0_CHECK;
+            probLen = prob + LenMid + (posState << kLenNumMidBits);
+            offset = kLenNumLowSymbols;
+            limit = 1 << kLenNumMidBits;
+          }
+          else
+          {
+            UPDATE_1_CHECK;
+            probLen = prob + LenHigh;
+            offset = kLenNumLowSymbols + kLenNumMidSymbols;
+            limit = 1 << kLenNumHighBits;
+          }
+        }
+        TREE_DECODE_CHECK(probLen, limit, len);
+        len += offset;
+      }
+
+      if (state < 4)
+      {
+        unsigned posSlot;
+        prob = probs + PosSlot +
+            ((len < kNumLenToPosStates ? len : kNumLenToPosStates - 1) <<
+            kNumPosSlotBits);
+        TREE_DECODE_CHECK(prob, 1 << kNumPosSlotBits, posSlot);
+        if (posSlot >= kStartPosModelIndex)
+        {
+          int numDirectBits = ((posSlot >> 1) - 1);
+
+          /* if (bufLimit - buf >= 8) return DUMMY_MATCH; */
+
+          if (posSlot < kEndPosModelIndex)
+          {
+            prob = probs + SpecPos + ((2 | (posSlot & 1)) << numDirectBits) - posSlot - 1;
+          }
+          else
+          {
+            numDirectBits -= kNumAlignBits;
+            do
+            {
+              NORMALIZE_CHECK
+              range >>= 1;
+              code -= range & (((code - range) >> 31) - 1);
+              /* if (code >= range) code -= range; */
+            }
+            while (--numDirectBits != 0);
+            prob = probs + Align;
+            numDirectBits = kNumAlignBits;
+          }
+          {
+            unsigned i = 1;
+            do
+            {
+              GET_BIT_CHECK(prob + i, i);
+            }
+            while (--numDirectBits != 0);
+          }
+        }
+      }
+    }
+  }
+  NORMALIZE_CHECK;
+  return res;
+}
+
+
+static void LzmaDec_InitRc(CLzmaDec *p, const Byte *data)
+{
+  p->code = ((UInt32)data[1] << 24) | ((UInt32)data[2] << 16) | ((UInt32)data[3] << 8) | ((UInt32)data[4]);
+  p->range = 0xFFFFFFFF;
+  p->needFlush = 0;
+}
+
+static void LzmaDec_InitDicAndState(CLzmaDec *p, Bool initDic, Bool initState)
+{
+  p->needFlush = 1;
+  p->remainLen = 0;
+  p->tempBufSize = 0;
+
+  if (initDic)
+  {
+    p->processedPos = 0;
+    p->checkDicSize = 0;
+    p->needInitState = 1;
+  }
+  if (initState)
+    p->needInitState = 1;
+}
+
+static void LzmaDec_Init(CLzmaDec *p)
+{
+  p->dicPos = 0;
+  LzmaDec_InitDicAndState(p, True, True);
+}
+
+static void LzmaDec_InitStateReal(CLzmaDec *p)
+{
+  UInt32 numProbs = Literal + ((UInt32)LZMA_LIT_SIZE << (p->prop.lc + p->prop.lp));
+  UInt32 i;
+  CLzmaProb *probs = p->probs;
+  for (i = 0; i < numProbs; i++)
+    probs[i] = kBitModelTotal >> 1;
+  p->reps[0] = p->reps[1] = p->reps[2] = p->reps[3] = 1;
+  p->state = 0;
+  p->needInitState = 0;
+}
+
+static SRes LzmaDec_DecodeToDic(CLzmaDec *p, SizeT dicLimit, const Byte *src, SizeT *srcLen,
+    ELzmaFinishMode finishMode, ELzmaStatus *status)
+{
+  SizeT inSize = *srcLen;
+  (*srcLen) = 0;
+  LzmaDec_WriteRem(p, dicLimit);
+
+  *status = LZMA_STATUS_NOT_SPECIFIED;
+
+  while (p->remainLen != kMatchSpecLenStart)
+  {
+      int checkEndMarkNow;
+
+      if (p->needFlush != 0)
+      {
+        for (; inSize > 0 && p->tempBufSize < RC_INIT_SIZE; (*srcLen)++, inSize--)
+          p->tempBuf[p->tempBufSize++] = *src++;
+        if (p->tempBufSize < RC_INIT_SIZE)
+        {
+          *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+          return SZ_OK;
+        }
+        if (p->tempBuf[0] != 0)
+          return SZ_ERROR_DATA;
+
+        LzmaDec_InitRc(p, p->tempBuf);
+        p->tempBufSize = 0;
+      }
+
+      checkEndMarkNow = 0;
+      if (p->dicPos >= dicLimit)
+      {
+        if (p->remainLen == 0 && p->code == 0)
+        {
+          *status = LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK;
+          return SZ_OK;
+        }
+        if (finishMode == LZMA_FINISH_ANY)
+        {
+          *status = LZMA_STATUS_NOT_FINISHED;
+          return SZ_OK;
+        }
+        if (p->remainLen != 0)
+        {
+          *status = LZMA_STATUS_NOT_FINISHED;
+          return SZ_ERROR_DATA;
+        }
+        checkEndMarkNow = 1;
+      }
+
+      if (p->needInitState)
+        LzmaDec_InitStateReal(p);
+
+      if (p->tempBufSize == 0)
+      {
+        SizeT processed;
+        const Byte *bufLimit;
+        if (inSize < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)
+        {
+          int dummyRes = LzmaDec_TryDummy(p, src, inSize);
+          if (dummyRes == DUMMY_ERROR)
+          {
+            memcpy(p->tempBuf, src, inSize);
+            p->tempBufSize = (unsigned)inSize;
+            (*srcLen) += inSize;
+            *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+            return SZ_OK;
+          }
+          if (checkEndMarkNow && dummyRes != DUMMY_MATCH)
+          {
+            *status = LZMA_STATUS_NOT_FINISHED;
+            return SZ_ERROR_DATA;
+          }
+          bufLimit = src;
+        }
+        else
+          bufLimit = src + inSize - LZMA_REQUIRED_INPUT_MAX;
+        p->buf = src;
+        if (LzmaDec_DecodeReal2(p, dicLimit, bufLimit) != 0)
+          return SZ_ERROR_DATA;
+        processed = (SizeT)(p->buf - src);
+        (*srcLen) += processed;
+        src += processed;
+        inSize -= processed;
+      }
+      else
+      {
+        unsigned rem = p->tempBufSize, lookAhead = 0;
+        while (rem < LZMA_REQUIRED_INPUT_MAX && lookAhead < inSize)
+          p->tempBuf[rem++] = src[lookAhead++];
+        p->tempBufSize = rem;
+        if (rem < LZMA_REQUIRED_INPUT_MAX || checkEndMarkNow)
+        {
+          int dummyRes = LzmaDec_TryDummy(p, p->tempBuf, rem);
+          if (dummyRes == DUMMY_ERROR)
+          {
+            (*srcLen) += lookAhead;
+            *status = LZMA_STATUS_NEEDS_MORE_INPUT;
+            return SZ_OK;
+          }
+          if (checkEndMarkNow && dummyRes != DUMMY_MATCH)
+          {
+            *status = LZMA_STATUS_NOT_FINISHED;
+            return SZ_ERROR_DATA;
+          }
+        }
+        p->buf = p->tempBuf;
+        if (LzmaDec_DecodeReal2(p, dicLimit, p->buf) != 0)
+          return SZ_ERROR_DATA;
+        lookAhead -= (rem - (unsigned)(p->buf - p->tempBuf));
+        (*srcLen) += lookAhead;
+        src += lookAhead;
+        inSize -= lookAhead;
+        p->tempBufSize = 0;
+      }
+  }
+  if (p->code == 0)
+    *status = LZMA_STATUS_FINISHED_WITH_MARK;
+  return (p->code == 0) ? SZ_OK : SZ_ERROR_DATA;
+}
+
+static void LzmaDec_FreeProbs(CLzmaDec *p, ISzAlloc *alloc)
+{
+  alloc->Free(alloc, p->probs);
+  p->probs = 0;
+}
+
+static SRes LzmaProps_Decode(CLzmaProps *p, const Byte *data, unsigned size)
+{
+  UInt32 dicSize;
+  Byte d;
+
+  if (size < LZMA_PROPS_SIZE)
+    return SZ_ERROR_UNSUPPORTED;
+  else
+    dicSize = data[1] | ((UInt32)data[2] << 8) | ((UInt32)data[3] << 16) | ((UInt32)data[4] << 24);
+
+  if (dicSize < LZMA_DIC_MIN)
+    dicSize = LZMA_DIC_MIN;
+  p->dicSize = dicSize;
+
+  d = data[0];
+  if (d >= (9 * 5 * 5))
+    return SZ_ERROR_UNSUPPORTED;
+
+  p->lc = d % 9;
+  d /= 9;
+  p->pb = d / 5;
+  p->lp = d % 5;
+
+  return SZ_OK;
+}
+
+static SRes LzmaDec_AllocateProbs2(CLzmaDec *p, const CLzmaProps *propNew, ISzAlloc *alloc)
+{
+  UInt32 numProbs = LzmaProps_GetNumProbs(propNew);
+  if (p->probs == 0 || numProbs != p->numProbs)
+  {
+    LzmaDec_FreeProbs(p, alloc);
+    p->probs = (CLzmaProb *)alloc->Alloc(alloc, numProbs * sizeof(CLzmaProb));
+    p->numProbs = numProbs;
+    if (p->probs == 0)
+      return SZ_ERROR_MEM;
+  }
+  return SZ_OK;
+}
+
+static SRes LzmaDec_AllocateProbs(CLzmaDec *p, const Byte *props, unsigned propsSize, ISzAlloc *alloc)
+{
+  CLzmaProps propNew;
+  RINOK(LzmaProps_Decode(&propNew, props, propsSize));
+  RINOK(LzmaDec_AllocateProbs2(p, &propNew, alloc));
+  p->prop = propNew;
+  return SZ_OK;
+}
+
+SRes LzmaDecode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen,
+    const Byte *propData, unsigned propSize, ELzmaFinishMode finishMode,
+    ELzmaStatus *status, ISzAlloc *alloc)
+{
+  CLzmaDec p;
+  SRes res;
+  SizeT inSize = *srcLen;
+  SizeT outSize = *destLen;
+  *srcLen = *destLen = 0;
+  if (inSize < RC_INIT_SIZE)
+    return SZ_ERROR_INPUT_EOF;
+
+  LzmaDec_Construct(&p);
+  res = LzmaDec_AllocateProbs(&p, propData, propSize, alloc);
+  if (res != 0)
+    return res;
+  p.dic = dest;
+  p.dicBufSize = outSize;
+
+  LzmaDec_Init(&p);
+
+  *srcLen = inSize;
+  res = LzmaDec_DecodeToDic(&p, outSize, src, srcLen, finishMode, status);
+
+  if (res == SZ_OK && *status == LZMA_STATUS_NEEDS_MORE_INPUT)
+    res = SZ_ERROR_INPUT_EOF;
+
+  (*destLen) = p.dicPos;
+  LzmaDec_FreeProbs(&p, alloc);
+  return res;
+}
--- /dev/null
+++ b/lib/lzma/LzmaEnc.c
@@ -0,0 +1,2123 @@
+/* LzmaEnc.c -- LZMA Encoder
+2009-11-24 : Igor Pavlov : Public domain */
+
+#include <string.h>
+
+/* #define SHOW_STAT */
+/* #define SHOW_STAT2 */
+
+#if defined(SHOW_STAT) || defined(SHOW_STAT2)
+#include <stdio.h>
+#endif
+
+#include "LzmaEnc.h"
+
+/* disable MT */
+#define _7ZIP_ST
+
+#include "LzFind.h"
+#ifndef _7ZIP_ST
+#include "LzFindMt.h"
+#endif
+
+#ifdef SHOW_STAT
+static int ttt = 0;
+#endif
+
+#define kBlockSizeMax ((1 << LZMA_NUM_BLOCK_SIZE_BITS) - 1)
+
+#define kBlockSize (9 << 10)
+#define kUnpackBlockSize (1 << 18)
+#define kMatchArraySize (1 << 21)
+#define kMatchRecordMaxSize ((LZMA_MATCH_LEN_MAX * 2 + 3) * LZMA_MATCH_LEN_MAX)
+
+#define kNumMaxDirectBits (31)
+
+#define kNumTopBits 24
+#define kTopValue ((UInt32)1 << kNumTopBits)
+
+#define kNumBitModelTotalBits 11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+#define kNumMoveBits 5
+#define kProbInitValue (kBitModelTotal >> 1)
+
+#define kNumMoveReducingBits 4
+#define kNumBitPriceShiftBits 4
+#define kBitPrice (1 << kNumBitPriceShiftBits)
+
+void LzmaEncProps_Init(CLzmaEncProps *p)
+{
+  p->level = 5;
+  p->dictSize = p->mc = 0;
+  p->lc = p->lp = p->pb = p->algo = p->fb = p->btMode = p->numHashBytes = p->numThreads = -1;
+  p->writeEndMark = 0;
+}
+
+static void LzmaEncProps_Normalize(CLzmaEncProps *p)
+{
+  int level = p->level;
+  if (level < 0) level = 5;
+  p->level = level;
+  if (p->dictSize == 0) p->dictSize = (level <= 5 ? (1 << (level * 2 + 14)) : (level == 6 ? (1 << 25) : (1 << 26)));
+  if (p->lc < 0) p->lc = 3;
+  if (p->lp < 0) p->lp = 0;
+  if (p->pb < 0) p->pb = 2;
+  if (p->algo < 0) p->algo = (level < 5 ? 0 : 1);
+  if (p->fb < 0) p->fb = (level < 7 ? 32 : 64);
+  if (p->btMode < 0) p->btMode = (p->algo == 0 ? 0 : 1);
+  if (p->numHashBytes < 0) p->numHashBytes = 4;
+  if (p->mc == 0)  p->mc = (16 + (p->fb >> 1)) >> (p->btMode ? 0 : 1);
+  if (p->numThreads < 0)
+    p->numThreads =
+      #ifndef _7ZIP_ST
+      ((p->btMode && p->algo) ? 2 : 1);
+      #else
+      1;
+      #endif
+}
+
+static UInt32 __maybe_unused LzmaEncProps_GetDictSize(const CLzmaEncProps *props2)
+{
+  CLzmaEncProps props = *props2;
+  LzmaEncProps_Normalize(&props);
+  return props.dictSize;
+}
+
+/* #define LZMA_LOG_BSR */
+/* Define it for Intel's CPU */
+
+
+#ifdef LZMA_LOG_BSR
+
+#define kDicLogSizeMaxCompress 30
+
+#define BSR2_RET(pos, res) { unsigned long i; _BitScanReverse(&i, (pos)); res = (i + i) + ((pos >> (i - 1)) & 1); }
+
+static UInt32 GetPosSlot1(UInt32 pos)
+{
+  UInt32 res;
+  BSR2_RET(pos, res);
+  return res;
+}
+#define GetPosSlot2(pos, res) { BSR2_RET(pos, res); }
+#define GetPosSlot(pos, res) { if (pos < 2) res = pos; else BSR2_RET(pos, res); }
+
+#else
+
+#define kNumLogBits (9 + (int)sizeof(size_t) / 2)
+#define kDicLogSizeMaxCompress ((kNumLogBits - 1) * 2 + 7)
+
+static void LzmaEnc_FastPosInit(Byte *g_FastPos)
+{
+  int c = 2, slotFast;
+  g_FastPos[0] = 0;
+  g_FastPos[1] = 1;
+
+  for (slotFast = 2; slotFast < kNumLogBits * 2; slotFast++)
+  {
+    UInt32 k = (1 << ((slotFast >> 1) - 1));
+    UInt32 j;
+    for (j = 0; j < k; j++, c++)
+      g_FastPos[c] = (Byte)slotFast;
+  }
+}
+
+#define BSR2_RET(pos, res) { UInt32 i = 6 + ((kNumLogBits - 1) & \
+  (0 - (((((UInt32)1 << (kNumLogBits + 6)) - 1) - pos) >> 31))); \
+  res = p->g_FastPos[pos >> i] + (i * 2); }
+/*
+#define BSR2_RET(pos, res) { res = (pos < (1 << (kNumLogBits + 6))) ? \
+  p->g_FastPos[pos >> 6] + 12 : \
+  p->g_FastPos[pos >> (6 + kNumLogBits - 1)] + (6 + (kNumLogBits - 1)) * 2; }
+*/
+
+#define GetPosSlot1(pos) p->g_FastPos[pos]
+#define GetPosSlot2(pos, res) { BSR2_RET(pos, res); }
+#define GetPosSlot(pos, res) { if (pos < kNumFullDistances) res = p->g_FastPos[pos]; else BSR2_RET(pos, res); }
+
+#endif
+
+
+#define LZMA_NUM_REPS 4
+
+typedef unsigned CState;
+
+typedef struct
+{
+  UInt32 price;
+
+  CState state;
+  int prev1IsChar;
+  int prev2;
+
+  UInt32 posPrev2;
+  UInt32 backPrev2;
+
+  UInt32 posPrev;
+  UInt32 backPrev;
+  UInt32 backs[LZMA_NUM_REPS];
+} COptimal;
+
+#define kNumOpts (1 << 12)
+
+#define kNumLenToPosStates 4
+#define kNumPosSlotBits 6
+#define kDicLogSizeMin 0
+#define kDicLogSizeMax 32
+#define kDistTableSizeMax (kDicLogSizeMax * 2)
+
+
+#define kNumAlignBits 4
+#define kAlignTableSize (1 << kNumAlignBits)
+#define kAlignMask (kAlignTableSize - 1)
+
+#define kStartPosModelIndex 4
+#define kEndPosModelIndex 14
+#define kNumPosModels (kEndPosModelIndex - kStartPosModelIndex)
+
+#define kNumFullDistances (1 << (kEndPosModelIndex >> 1))
+
+#ifdef _LZMA_PROB32
+#define CLzmaProb UInt32
+#else
+#define CLzmaProb UInt16
+#endif
+
+#define LZMA_PB_MAX 4
+#define LZMA_LC_MAX 8
+#define LZMA_LP_MAX 4
+
+#define LZMA_NUM_PB_STATES_MAX (1 << LZMA_PB_MAX)
+
+
+#define kLenNumLowBits 3
+#define kLenNumLowSymbols (1 << kLenNumLowBits)
+#define kLenNumMidBits 3
+#define kLenNumMidSymbols (1 << kLenNumMidBits)
+#define kLenNumHighBits 8
+#define kLenNumHighSymbols (1 << kLenNumHighBits)
+
+#define kLenNumSymbolsTotal (kLenNumLowSymbols + kLenNumMidSymbols + kLenNumHighSymbols)
+
+#define LZMA_MATCH_LEN_MIN 2
+#define LZMA_MATCH_LEN_MAX (LZMA_MATCH_LEN_MIN + kLenNumSymbolsTotal - 1)
+
+#define kNumStates 12
+
+typedef struct
+{
+  CLzmaProb choice;
+  CLzmaProb choice2;
+  CLzmaProb low[LZMA_NUM_PB_STATES_MAX << kLenNumLowBits];
+  CLzmaProb mid[LZMA_NUM_PB_STATES_MAX << kLenNumMidBits];
+  CLzmaProb high[kLenNumHighSymbols];
+} CLenEnc;
+
+typedef struct
+{
+  CLenEnc p;
+  UInt32 prices[LZMA_NUM_PB_STATES_MAX][kLenNumSymbolsTotal];
+  UInt32 tableSize;
+  UInt32 counters[LZMA_NUM_PB_STATES_MAX];
+} CLenPriceEnc;
+
+typedef struct
+{
+  UInt32 range;
+  Byte cache;
+  UInt64 low;
+  UInt64 cacheSize;
+  Byte *buf;
+  Byte *bufLim;
+  Byte *bufBase;
+  ISeqOutStream *outStream;
+  UInt64 processed;
+  SRes res;
+} CRangeEnc;
+
+typedef struct
+{
+  CLzmaProb *litProbs;
+
+  CLzmaProb isMatch[kNumStates][LZMA_NUM_PB_STATES_MAX];
+  CLzmaProb isRep[kNumStates];
+  CLzmaProb isRepG0[kNumStates];
+  CLzmaProb isRepG1[kNumStates];
+  CLzmaProb isRepG2[kNumStates];
+  CLzmaProb isRep0Long[kNumStates][LZMA_NUM_PB_STATES_MAX];
+
+  CLzmaProb posSlotEncoder[kNumLenToPosStates][1 << kNumPosSlotBits];
+  CLzmaProb posEncoders[kNumFullDistances - kEndPosModelIndex];
+  CLzmaProb posAlignEncoder[1 << kNumAlignBits];
+
+  CLenPriceEnc lenEnc;
+  CLenPriceEnc repLenEnc;
+
+  UInt32 reps[LZMA_NUM_REPS];
+  UInt32 state;
+} CSaveState;
+
+typedef struct
+{
+  IMatchFinder matchFinder;
+  void *matchFinderObj;
+
+  #ifndef _7ZIP_ST
+  Bool mtMode;
+  CMatchFinderMt matchFinderMt;
+  #endif
+
+  CMatchFinder matchFinderBase;
+
+  #ifndef _7ZIP_ST
+  Byte pad[128];
+  #endif
+
+  UInt32 optimumEndIndex;
+  UInt32 optimumCurrentIndex;
+
+  UInt32 longestMatchLength;
+  UInt32 numPairs;
+  UInt32 numAvail;
+  COptimal opt[kNumOpts];
+
+  #ifndef LZMA_LOG_BSR
+  Byte g_FastPos[1 << kNumLogBits];
+  #endif
+
+  UInt32 ProbPrices[kBitModelTotal >> kNumMoveReducingBits];
+  UInt32 matches[LZMA_MATCH_LEN_MAX * 2 + 2 + 1];
+  UInt32 numFastBytes;
+  UInt32 additionalOffset;
+  UInt32 reps[LZMA_NUM_REPS];
+  UInt32 state;
+
+  UInt32 posSlotPrices[kNumLenToPosStates][kDistTableSizeMax];
+  UInt32 distancesPrices[kNumLenToPosStates][kNumFullDistances];
+  UInt32 alignPrices[kAlignTableSize];
+  UInt32 alignPriceCount;
+
+  UInt32 distTableSize;
+
+  unsigned lc, lp, pb;
+  unsigned lpMask, pbMask;
+
+  CLzmaProb *litProbs;
+
+  CLzmaProb isMatch[kNumStates][LZMA_NUM_PB_STATES_MAX];
+  CLzmaProb isRep[kNumStates];
+  CLzmaProb isRepG0[kNumStates];
+  CLzmaProb isRepG1[kNumStates];
+  CLzmaProb isRepG2[kNumStates];
+  CLzmaProb isRep0Long[kNumStates][LZMA_NUM_PB_STATES_MAX];
+
+  CLzmaProb posSlotEncoder[kNumLenToPosStates][1 << kNumPosSlotBits];
+  CLzmaProb posEncoders[kNumFullDistances - kEndPosModelIndex];
+  CLzmaProb posAlignEncoder[1 << kNumAlignBits];
+
+  CLenPriceEnc lenEnc;
+  CLenPriceEnc repLenEnc;
+
+  unsigned lclp;
+
+  Bool fastMode;
+
+  CRangeEnc rc;
+
+  Bool writeEndMark;
+  UInt64 nowPos64;
+  UInt32 matchPriceCount;
+  Bool finished;
+  Bool multiThread;
+
+  SRes result;
+  UInt32 dictSize;
+  UInt32 matchFinderCycles;
+
+  int needInit;
+
+  CSaveState saveState;
+} CLzmaEnc;
+
+SRes LzmaEnc_SetProps(CLzmaEncHandle pp, const CLzmaEncProps *props2)
+{
+  CLzmaEnc *p = (CLzmaEnc *)pp;
+  CLzmaEncProps props = *props2;
+  LzmaEncProps_Normalize(&props);
+
+  if (props.lc > LZMA_LC_MAX || props.lp > LZMA_LP_MAX || props.pb > LZMA_PB_MAX ||
+      props.dictSize > (1 << kDicLogSizeMaxCompress) || props.dictSize > (1 << 30))
+    return SZ_ERROR_PARAM;
+  p->dictSize = props.dictSize;
+  p->matchFinderCycles = props.mc;
+  {
+    unsigned fb = props.fb;
+    if (fb < 5)
+      fb = 5;
+    if (fb > LZMA_MATCH_LEN_MAX)
+      fb = LZMA_MATCH_LEN_MAX;
+    p->numFastBytes = fb;
+  }
+  p->lc = props.lc;
+  p->lp = props.lp;
+  p->pb = props.pb;
+  p->fastMode = (props.algo == 0);
+  p->matchFinderBase.btMode = props.btMode;
+  {
+    UInt32 numHashBytes = 4;
+    if (props.btMode)
+    {
+      if (props.numHashBytes < 2)
+        numHashBytes = 2;
+      else if (props.numHashBytes < 4)
+        numHashBytes = props.numHashBytes;
+    }
+    p->matchFinderBase.numHashBytes = numHashBytes;
+  }
+
+  p->matchFinderBase.cutValue = props.mc;
+
+  p->writeEndMark = props.writeEndMark;
+
+  #ifndef _7ZIP_ST
+  /*
+  if (newMultiThread != _multiThread)
+  {
+    ReleaseMatchFinder();
+    _multiThread = newMultiThread;
+  }
+  */
+  p->multiThread = (props.numThreads > 1);
+  #endif
+
+  return SZ_OK;
+}
+
+static const int kLiteralNextStates[kNumStates] = {0, 0, 0, 0, 1, 2, 3, 4,  5,  6,   4, 5};
+static const int kMatchNextStates[kNumStates]   = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
+static const int kRepNextStates[kNumStates]     = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
+static const int kShortRepNextStates[kNumStates]= {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
+
+#define IsCharState(s) ((s) < 7)
+
+#define GetLenToPosState(len) (((len) < kNumLenToPosStates + 1) ? (len) - 2 : kNumLenToPosStates - 1)
+
+#define kInfinityPrice (1 << 30)
+
+static void RangeEnc_Construct(CRangeEnc *p)
+{
+  p->outStream = 0;
+  p->bufBase = 0;
+}
+
+#define RangeEnc_GetProcessed(p) ((p)->processed + ((p)->buf - (p)->bufBase) + (p)->cacheSize)
+
+#define RC_BUF_SIZE (1 << 16)
+static int RangeEnc_Alloc(CRangeEnc *p, ISzAlloc *alloc)
+{
+  if (p->bufBase == 0)
+  {
+    p->bufBase = (Byte *)alloc->Alloc(alloc, RC_BUF_SIZE);
+    if (p->bufBase == 0)
+      return 0;
+    p->bufLim = p->bufBase + RC_BUF_SIZE;
+  }
+  return 1;
+}
+
+static void RangeEnc_Free(CRangeEnc *p, ISzAlloc *alloc)
+{
+  alloc->Free(alloc, p->bufBase);
+  p->bufBase = 0;
+}
+
+static void RangeEnc_Init(CRangeEnc *p)
+{
+  /* Stream.Init(); */
+  p->low = 0;
+  p->range = 0xFFFFFFFF;
+  p->cacheSize = 1;
+  p->cache = 0;
+
+  p->buf = p->bufBase;
+
+  p->processed = 0;
+  p->res = SZ_OK;
+}
+
+static void RangeEnc_FlushStream(CRangeEnc *p)
+{
+  size_t num;
+  if (p->res != SZ_OK)
+    return;
+  num = p->buf - p->bufBase;
+  if (num != p->outStream->Write(p->outStream, p->bufBase, num))
+    p->res = SZ_ERROR_WRITE;
+  p->processed += num;
+  p->buf = p->bufBase;
+}
+
+static void MY_FAST_CALL RangeEnc_ShiftLow(CRangeEnc *p)
+{
+  if ((UInt32)p->low < (UInt32)0xFF000000 || (int)(p->low >> 32) != 0)
+  {
+    Byte temp = p->cache;
+    do
+    {
+      Byte *buf = p->buf;
+      *buf++ = (Byte)(temp + (Byte)(p->low >> 32));
+      p->buf = buf;
+      if (buf == p->bufLim)
+        RangeEnc_FlushStream(p);
+      temp = 0xFF;
+    }
+    while (--p->cacheSize != 0);
+    p->cache = (Byte)((UInt32)p->low >> 24);
+  }
+  p->cacheSize++;
+  p->low = (UInt32)p->low << 8;
+}
+
+static void RangeEnc_FlushData(CRangeEnc *p)
+{
+  int i;
+  for (i = 0; i < 5; i++)
+    RangeEnc_ShiftLow(p);
+}
+
+static void RangeEnc_EncodeDirectBits(CRangeEnc *p, UInt32 value, int numBits)
+{
+  do
+  {
+    p->range >>= 1;
+    p->low += p->range & (0 - ((value >> --numBits) & 1));
+    if (p->range < kTopValue)
+    {
+      p->range <<= 8;
+      RangeEnc_ShiftLow(p);
+    }
+  }
+  while (numBits != 0);
+}
+
+static void RangeEnc_EncodeBit(CRangeEnc *p, CLzmaProb *prob, UInt32 symbol)
+{
+  UInt32 ttt = *prob;
+  UInt32 newBound = (p->range >> kNumBitModelTotalBits) * ttt;
+  if (symbol == 0)
+  {
+    p->range = newBound;
+    ttt += (kBitModelTotal - ttt) >> kNumMoveBits;
+  }
+  else
+  {
+    p->low += newBound;
+    p->range -= newBound;
+    ttt -= ttt >> kNumMoveBits;
+  }
+  *prob = (CLzmaProb)ttt;
+  if (p->range < kTopValue)
+  {
+    p->range <<= 8;
+    RangeEnc_ShiftLow(p);
+  }
+}
+
+static void LitEnc_Encode(CRangeEnc *p, CLzmaProb *probs, UInt32 symbol)
+{
+  symbol |= 0x100;
+  do
+  {
+    RangeEnc_EncodeBit(p, probs + (symbol >> 8), (symbol >> 7) & 1);
+    symbol <<= 1;
+  }
+  while (symbol < 0x10000);
+}
+
+static void LitEnc_EncodeMatched(CRangeEnc *p, CLzmaProb *probs, UInt32 symbol, UInt32 matchByte)
+{
+  UInt32 offs = 0x100;
+  symbol |= 0x100;
+  do
+  {
+    matchByte <<= 1;
+    RangeEnc_EncodeBit(p, probs + (offs + (matchByte & offs) + (symbol >> 8)), (symbol >> 7) & 1);
+    symbol <<= 1;
+    offs &= ~(matchByte ^ symbol);
+  }
+  while (symbol < 0x10000);
+}
+
+static void LzmaEnc_InitPriceTables(UInt32 *ProbPrices)
+{
+  UInt32 i;
+  for (i = (1 << kNumMoveReducingBits) / 2; i < kBitModelTotal; i += (1 << kNumMoveReducingBits))
+  {
+    const int kCyclesBits = kNumBitPriceShiftBits;
+    UInt32 w = i;
+    UInt32 bitCount = 0;
+    int j;
+    for (j = 0; j < kCyclesBits; j++)
+    {
+      w = w * w;
+      bitCount <<= 1;
+      while (w >= ((UInt32)1 << 16))
+      {
+        w >>= 1;
+        bitCount++;
+      }
+    }
+    ProbPrices[i >> kNumMoveReducingBits] = ((kNumBitModelTotalBits << kCyclesBits) - 15 - bitCount);
+  }
+}
+
+
+#define GET_PRICE(prob, symbol) \
+  p->ProbPrices[((prob) ^ (((-(int)(symbol))) & (kBitModelTotal - 1))) >> kNumMoveReducingBits];
+
+#define GET_PRICEa(prob, symbol) \
+  ProbPrices[((prob) ^ ((-((int)(symbol))) & (kBitModelTotal - 1))) >> kNumMoveReducingBits];
+
+#define GET_PRICE_0(prob) p->ProbPrices[(prob) >> kNumMoveReducingBits]
+#define GET_PRICE_1(prob) p->ProbPrices[((prob) ^ (kBitModelTotal - 1)) >> kNumMoveReducingBits]
+
+#define GET_PRICE_0a(prob) ProbPrices[(prob) >> kNumMoveReducingBits]
+#define GET_PRICE_1a(prob) ProbPrices[((prob) ^ (kBitModelTotal - 1)) >> kNumMoveReducingBits]
+
+static UInt32 LitEnc_GetPrice(const CLzmaProb *probs, UInt32 symbol, UInt32 *ProbPrices)
+{
+  UInt32 price = 0;
+  symbol |= 0x100;
+  do
+  {
+    price += GET_PRICEa(probs[symbol >> 8], (symbol >> 7) & 1);
+    symbol <<= 1;
+  }
+  while (symbol < 0x10000);
+  return price;
+}
+
+static UInt32 LitEnc_GetPriceMatched(const CLzmaProb *probs, UInt32 symbol, UInt32 matchByte, UInt32 *ProbPrices)
+{
+  UInt32 price = 0;
+  UInt32 offs = 0x100;
+  symbol |= 0x100;
+  do
+  {
+    matchByte <<= 1;
+    price += GET_PRICEa(probs[offs + (matchByte & offs) + (symbol >> 8)], (symbol >> 7) & 1);
+    symbol <<= 1;
+    offs &= ~(matchByte ^ symbol);
+  }
+  while (symbol < 0x10000);
+  return price;
+}
+
+
+static void RcTree_Encode(CRangeEnc *rc, CLzmaProb *probs, int numBitLevels, UInt32 symbol)
+{
+  UInt32 m = 1;
+  int i;
+  for (i = numBitLevels; i != 0;)
+  {
+    UInt32 bit;
+    i--;
+    bit = (symbol >> i) & 1;
+    RangeEnc_EncodeBit(rc, probs + m, bit);
+    m = (m << 1) | bit;
+  }
+}
+
+static void RcTree_ReverseEncode(CRangeEnc *rc, CLzmaProb *probs, int numBitLevels, UInt32 symbol)
+{
+  UInt32 m = 1;
+  int i;
+  for (i = 0; i < numBitLevels; i++)
+  {
+    UInt32 bit = symbol & 1;
+    RangeEnc_EncodeBit(rc, probs + m, bit);
+    m = (m << 1) | bit;
+    symbol >>= 1;
+  }
+}
+
+static UInt32 RcTree_GetPrice(const CLzmaProb *probs, int numBitLevels, UInt32 symbol, UInt32 *ProbPrices)
+{
+  UInt32 price = 0;
+  symbol |= (1 << numBitLevels);
+  while (symbol != 1)
+  {
+    price += GET_PRICEa(probs[symbol >> 1], symbol & 1);
+    symbol >>= 1;
+  }
+  return price;
+}
+
+static UInt32 RcTree_ReverseGetPrice(const CLzmaProb *probs, int numBitLevels, UInt32 symbol, UInt32 *ProbPrices)
+{
+  UInt32 price = 0;
+  UInt32 m = 1;
+  int i;
+  for (i = numBitLevels; i != 0; i--)
+  {
+    UInt32 bit = symbol & 1;
+    symbol >>= 1;
+    price += GET_PRICEa(probs[m], bit);
+    m = (m << 1) | bit;
+  }
+  return price;
+}
+
+
+static void LenEnc_Init(CLenEnc *p)
+{
+  unsigned i;
+  p->choice = p->choice2 = kProbInitValue;
+  for (i = 0; i < (LZMA_NUM_PB_STATES_MAX << kLenNumLowBits); i++)
+    p->low[i] = kProbInitValue;
+  for (i = 0; i < (LZMA_NUM_PB_STATES_MAX << kLenNumMidBits); i++)
+    p->mid[i] = kProbInitValue;
+  for (i = 0; i < kLenNumHighSymbols; i++)
+    p->high[i] = kProbInitValue;
+}
+
+static void LenEnc_Encode(CLenEnc *p, CRangeEnc *rc, UInt32 symbol, UInt32 posState)
+{
+  if (symbol < kLenNumLowSymbols)
+  {
+    RangeEnc_EncodeBit(rc, &p->choice, 0);
+    RcTree_Encode(rc, p->low + (posState << kLenNumLowBits), kLenNumLowBits, symbol);
+  }
+  else
+  {
+    RangeEnc_EncodeBit(rc, &p->choice, 1);
+    if (symbol < kLenNumLowSymbols + kLenNumMidSymbols)
+    {
+      RangeEnc_EncodeBit(rc, &p->choice2, 0);
+      RcTree_Encode(rc, p->mid + (posState << kLenNumMidBits), kLenNumMidBits, symbol - kLenNumLowSymbols);
+    }
+    else
+    {
+      RangeEnc_EncodeBit(rc, &p->choice2, 1);
+      RcTree_Encode(rc, p->high, kLenNumHighBits, symbol - kLenNumLowSymbols - kLenNumMidSymbols);
+    }
+  }
+}
+
+static void LenEnc_SetPrices(CLenEnc *p, UInt32 posState, UInt32 numSymbols, UInt32 *prices, UInt32 *ProbPrices)
+{
+  UInt32 a0 = GET_PRICE_0a(p->choice);
+  UInt32 a1 = GET_PRICE_1a(p->choice);
+  UInt32 b0 = a1 + GET_PRICE_0a(p->choice2);
+  UInt32 b1 = a1 + GET_PRICE_1a(p->choice2);
+  UInt32 i = 0;
+  for (i = 0; i < kLenNumLowSymbols; i++)
+  {
+    if (i >= numSymbols)
+      return;
+    prices[i] = a0 + RcTree_GetPrice(p->low + (posState << kLenNumLowBits), kLenNumLowBits, i, ProbPrices);
+  }
+  for (; i < kLenNumLowSymbols + kLenNumMidSymbols; i++)
+  {
+    if (i >= numSymbols)
+      return;
+    prices[i] = b0 + RcTree_GetPrice(p->mid + (posState << kLenNumMidBits), kLenNumMidBits, i - kLenNumLowSymbols, ProbPrices);
+  }
+  for (; i < numSymbols; i++)
+    prices[i] = b1 + RcTree_GetPrice(p->high, kLenNumHighBits, i - kLenNumLowSymbols - kLenNumMidSymbols, ProbPrices);
+}
+
+static void MY_FAST_CALL LenPriceEnc_UpdateTable(CLenPriceEnc *p, UInt32 posState, UInt32 *ProbPrices)
+{
+  LenEnc_SetPrices(&p->p, posState, p->tableSize, p->prices[posState], ProbPrices);
+  p->counters[posState] = p->tableSize;
+}
+
+static void LenPriceEnc_UpdateTables(CLenPriceEnc *p, UInt32 numPosStates, UInt32 *ProbPrices)
+{
+  UInt32 posState;
+  for (posState = 0; posState < numPosStates; posState++)
+    LenPriceEnc_UpdateTable(p, posState, ProbPrices);
+}
+
+static void LenEnc_Encode2(CLenPriceEnc *p, CRangeEnc *rc, UInt32 symbol, UInt32 posState, Bool updatePrice, UInt32 *ProbPrices)
+{
+  LenEnc_Encode(&p->p, rc, symbol, posState);
+  if (updatePrice)
+    if (--p->counters[posState] == 0)
+      LenPriceEnc_UpdateTable(p, posState, ProbPrices);
+}
+
+
+
+
+static void MovePos(CLzmaEnc *p, UInt32 num)
+{
+  #ifdef SHOW_STAT
+  ttt += num;
+  printf("\n MovePos %d", num);
+  #endif
+  if (num != 0)
+  {
+    p->additionalOffset += num;
+    p->matchFinder.Skip(p->matchFinderObj, num);
+  }
+}
+
+static UInt32 ReadMatchDistances(CLzmaEnc *p, UInt32 *numDistancePairsRes)
+{
+  UInt32 lenRes = 0, numPairs;
+  p->numAvail = p->matchFinder.GetNumAvailableBytes(p->matchFinderObj);
+  numPairs = p->matchFinder.GetMatches(p->matchFinderObj, p->matches);
+  #ifdef SHOW_STAT
+  printf("\n i = %d numPairs = %d    ", ttt, numPairs / 2);
+  ttt++;
+  {
+    UInt32 i;
+    for (i = 0; i < numPairs; i += 2)
+      printf("%2d %6d   | ", p->matches[i], p->matches[i + 1]);
+  }
+  #endif
+  if (numPairs > 0)
+  {
+    lenRes = p->matches[numPairs - 2];
+    if (lenRes == p->numFastBytes)
+    {
+      const Byte *pby = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - 1;
+      UInt32 distance = p->matches[numPairs - 1] + 1;
+      UInt32 numAvail = p->numAvail;
+      if (numAvail > LZMA_MATCH_LEN_MAX)
+        numAvail = LZMA_MATCH_LEN_MAX;
+      {
+        const Byte *pby2 = pby - distance;
+        for (; lenRes < numAvail && pby[lenRes] == pby2[lenRes]; lenRes++);
+      }
+    }
+  }
+  p->additionalOffset++;
+  *numDistancePairsRes = numPairs;
+  return lenRes;
+}
+
+
+#define MakeAsChar(p) (p)->backPrev = (UInt32)(-1); (p)->prev1IsChar = False;
+#define MakeAsShortRep(p) (p)->backPrev = 0; (p)->prev1IsChar = False;
+#define IsShortRep(p) ((p)->backPrev == 0)
+
+static UInt32 GetRepLen1Price(CLzmaEnc *p, UInt32 state, UInt32 posState)
+{
+  return
+    GET_PRICE_0(p->isRepG0[state]) +
+    GET_PRICE_0(p->isRep0Long[state][posState]);
+}
+
+static UInt32 GetPureRepPrice(CLzmaEnc *p, UInt32 repIndex, UInt32 state, UInt32 posState)
+{
+  UInt32 price;
+  if (repIndex == 0)
+  {
+    price = GET_PRICE_0(p->isRepG0[state]);
+    price += GET_PRICE_1(p->isRep0Long[state][posState]);
+  }
+  else
+  {
+    price = GET_PRICE_1(p->isRepG0[state]);
+    if (repIndex == 1)
+      price += GET_PRICE_0(p->isRepG1[state]);
+    else
+    {
+      price += GET_PRICE_1(p->isRepG1[state]);
+      price += GET_PRICE(p->isRepG2[state], repIndex - 2);
+    }
+  }
+  return price;
+}
+
+static UInt32 GetRepPrice(CLzmaEnc *p, UInt32 repIndex, UInt32 len, UInt32 state, UInt32 posState)
+{
+  return p->repLenEnc.prices[posState][len - LZMA_MATCH_LEN_MIN] +
+    GetPureRepPrice(p, repIndex, state, posState);
+}
+
+static UInt32 Backward(CLzmaEnc *p, UInt32 *backRes, UInt32 cur)
+{
+  UInt32 posMem = p->opt[cur].posPrev;
+  UInt32 backMem = p->opt[cur].backPrev;
+  p->optimumEndIndex = cur;
+  do
+  {
+    if (p->opt[cur].prev1IsChar)
+    {
+      MakeAsChar(&p->opt[posMem])
+      p->opt[posMem].posPrev = posMem - 1;
+      if (p->opt[cur].prev2)
+      {
+        p->opt[posMem - 1].prev1IsChar = False;
+        p->opt[posMem - 1].posPrev = p->opt[cur].posPrev2;
+        p->opt[posMem - 1].backPrev = p->opt[cur].backPrev2;
+      }
+    }
+    {
+      UInt32 posPrev = posMem;
+      UInt32 backCur = backMem;
+
+      backMem = p->opt[posPrev].backPrev;
+      posMem = p->opt[posPrev].posPrev;
+
+      p->opt[posPrev].backPrev = backCur;
+      p->opt[posPrev].posPrev = cur;
+      cur = posPrev;
+    }
+  }
+  while (cur != 0);
+  *backRes = p->opt[0].backPrev;
+  p->optimumCurrentIndex  = p->opt[0].posPrev;
+  return p->optimumCurrentIndex;
+}
+
+#define LIT_PROBS(pos, prevByte) (p->litProbs + ((((pos) & p->lpMask) << p->lc) + ((prevByte) >> (8 - p->lc))) * 0x300)
+
+static UInt32 GetOptimum(CLzmaEnc *p, UInt32 position, UInt32 *backRes)
+{
+  UInt32 numAvail, mainLen, numPairs, repMaxIndex, i, posState, lenEnd, len, cur;
+  UInt32 matchPrice, repMatchPrice, normalMatchPrice;
+  UInt32 reps[LZMA_NUM_REPS], repLens[LZMA_NUM_REPS];
+  UInt32 *matches;
+  const Byte *data;
+  Byte curByte, matchByte;
+  if (p->optimumEndIndex != p->optimumCurrentIndex)
+  {
+    const COptimal *opt = &p->opt[p->optimumCurrentIndex];
+    UInt32 lenRes = opt->posPrev - p->optimumCurrentIndex;
+    *backRes = opt->backPrev;
+    p->optimumCurrentIndex = opt->posPrev;
+    return lenRes;
+  }
+  p->optimumCurrentIndex = p->optimumEndIndex = 0;
+
+  if (p->additionalOffset == 0)
+    mainLen = ReadMatchDistances(p, &numPairs);
+  else
+  {
+    mainLen = p->longestMatchLength;
+    numPairs = p->numPairs;
+  }
+
+  numAvail = p->numAvail;
+  if (numAvail < 2)
+  {
+    *backRes = (UInt32)(-1);
+    return 1;
+  }
+  if (numAvail > LZMA_MATCH_LEN_MAX)
+    numAvail = LZMA_MATCH_LEN_MAX;
+
+  data = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - 1;
+  repMaxIndex = 0;
+  for (i = 0; i < LZMA_NUM_REPS; i++)
+  {
+    UInt32 lenTest;
+    const Byte *data2;
+    reps[i] = p->reps[i];
+    data2 = data - (reps[i] + 1);
+    if (data[0] != data2[0] || data[1] != data2[1])
+    {
+      repLens[i] = 0;
+      continue;
+    }
+    for (lenTest = 2; lenTest < numAvail && data[lenTest] == data2[lenTest]; lenTest++);
+    repLens[i] = lenTest;
+    if (lenTest > repLens[repMaxIndex])
+      repMaxIndex = i;
+  }
+  if (repLens[repMaxIndex] >= p->numFastBytes)
+  {
+    UInt32 lenRes;
+    *backRes = repMaxIndex;
+    lenRes = repLens[repMaxIndex];
+    MovePos(p, lenRes - 1);
+    return lenRes;
+  }
+
+  matches = p->matches;
+  if (mainLen >= p->numFastBytes)
+  {
+    *backRes = matches[numPairs - 1] + LZMA_NUM_REPS;
+    MovePos(p, mainLen - 1);
+    return mainLen;
+  }
+  curByte = *data;
+  matchByte = *(data - (reps[0] + 1));
+
+  if (mainLen < 2 && curByte != matchByte && repLens[repMaxIndex] < 2)
+  {
+    *backRes = (UInt32)-1;
+    return 1;
+  }
+
+  p->opt[0].state = (CState)p->state;
+
+  posState = (position & p->pbMask);
+
+  {
+    const CLzmaProb *probs = LIT_PROBS(position, *(data - 1));
+    p->opt[1].price = GET_PRICE_0(p->isMatch[p->state][posState]) +
+        (!IsCharState(p->state) ?
+          LitEnc_GetPriceMatched(probs, curByte, matchByte, p->ProbPrices) :
+          LitEnc_GetPrice(probs, curByte, p->ProbPrices));
+  }
+
+  MakeAsChar(&p->opt[1]);
+
+  matchPrice = GET_PRICE_1(p->isMatch[p->state][posState]);
+  repMatchPrice = matchPrice + GET_PRICE_1(p->isRep[p->state]);
+
+  if (matchByte == curByte)
+  {
+    UInt32 shortRepPrice = repMatchPrice + GetRepLen1Price(p, p->state, posState);
+    if (shortRepPrice < p->opt[1].price)
+    {
+      p->opt[1].price = shortRepPrice;
+      MakeAsShortRep(&p->opt[1]);
+    }
+  }
+  lenEnd = ((mainLen >= repLens[repMaxIndex]) ? mainLen : repLens[repMaxIndex]);
+
+  if (lenEnd < 2)
+  {
+    *backRes = p->opt[1].backPrev;
+    return 1;
+  }
+
+  p->opt[1].posPrev = 0;
+  for (i = 0; i < LZMA_NUM_REPS; i++)
+    p->opt[0].backs[i] = reps[i];
+
+  len = lenEnd;
+  do
+    p->opt[len--].price = kInfinityPrice;
+  while (len >= 2);
+
+  for (i = 0; i < LZMA_NUM_REPS; i++)
+  {
+    UInt32 repLen = repLens[i];
+    UInt32 price;
+    if (repLen < 2)
+      continue;
+    price = repMatchPrice + GetPureRepPrice(p, i, p->state, posState);
+    do
+    {
+      UInt32 curAndLenPrice = price + p->repLenEnc.prices[posState][repLen - 2];
+      COptimal *opt = &p->opt[repLen];
+      if (curAndLenPrice < opt->price)
+      {
+        opt->price = curAndLenPrice;
+        opt->posPrev = 0;
+        opt->backPrev = i;
+        opt->prev1IsChar = False;
+      }
+    }
+    while (--repLen >= 2);
+  }
+
+  normalMatchPrice = matchPrice + GET_PRICE_0(p->isRep[p->state]);
+
+  len = ((repLens[0] >= 2) ? repLens[0] + 1 : 2);
+  if (len <= mainLen)
+  {
+    UInt32 offs = 0;
+    while (len > matches[offs])
+      offs += 2;
+    for (; ; len++)
+    {
+      COptimal *opt;
+      UInt32 distance = matches[offs + 1];
+
+      UInt32 curAndLenPrice = normalMatchPrice + p->lenEnc.prices[posState][len - LZMA_MATCH_LEN_MIN];
+      UInt32 lenToPosState = GetLenToPosState(len);
+      if (distance < kNumFullDistances)
+        curAndLenPrice += p->distancesPrices[lenToPosState][distance];
+      else
+      {
+        UInt32 slot;
+        GetPosSlot2(distance, slot);
+        curAndLenPrice += p->alignPrices[distance & kAlignMask] + p->posSlotPrices[lenToPosState][slot];
+      }
+      opt = &p->opt[len];
+      if (curAndLenPrice < opt->price)
+      {
+        opt->price = curAndLenPrice;
+        opt->posPrev = 0;
+        opt->backPrev = distance + LZMA_NUM_REPS;
+        opt->prev1IsChar = False;
+      }
+      if (len == matches[offs])
+      {
+        offs += 2;
+        if (offs == numPairs)
+          break;
+      }
+    }
+  }
+
+  cur = 0;
+
+    #ifdef SHOW_STAT2
+    if (position >= 0)
+    {
+      unsigned i;
+      printf("\n pos = %4X", position);
+      for (i = cur; i <= lenEnd; i++)
+      printf("\nprice[%4X] = %d", position - cur + i, p->opt[i].price);
+    }
+    #endif
+
+  for (;;)
+  {
+    UInt32 numAvailFull, newLen, numPairs, posPrev, state, posState, startLen;
+    UInt32 curPrice, curAnd1Price, matchPrice, repMatchPrice;
+    Bool nextIsChar;
+    Byte curByte, matchByte;
+    const Byte *data;
+    COptimal *curOpt;
+    COptimal *nextOpt;
+
+    cur++;
+    if (cur == lenEnd)
+      return Backward(p, backRes, cur);
+
+    newLen = ReadMatchDistances(p, &numPairs);
+    if (newLen >= p->numFastBytes)
+    {
+      p->numPairs = numPairs;
+      p->longestMatchLength = newLen;
+      return Backward(p, backRes, cur);
+    }
+    position++;
+    curOpt = &p->opt[cur];
+    posPrev = curOpt->posPrev;
+    if (curOpt->prev1IsChar)
+    {
+      posPrev--;
+      if (curOpt->prev2)
+      {
+        state = p->opt[curOpt->posPrev2].state;
+        if (curOpt->backPrev2 < LZMA_NUM_REPS)
+          state = kRepNextStates[state];
+        else
+          state = kMatchNextStates[state];
+      }
+      else
+        state = p->opt[posPrev].state;
+      state = kLiteralNextStates[state];
+    }
+    else
+      state = p->opt[posPrev].state;
+    if (posPrev == cur - 1)
+    {
+      if (IsShortRep(curOpt))
+        state = kShortRepNextStates[state];
+      else
+        state = kLiteralNextStates[state];
+    }
+    else
+    {
+      UInt32 pos;
+      const COptimal *prevOpt;
+      if (curOpt->prev1IsChar && curOpt->prev2)
+      {
+        posPrev = curOpt->posPrev2;
+        pos = curOpt->backPrev2;
+        state = kRepNextStates[state];
+      }
+      else
+      {
+        pos = curOpt->backPrev;
+        if (pos < LZMA_NUM_REPS)
+          state = kRepNextStates[state];
+        else
+          state = kMatchNextStates[state];
+      }
+      prevOpt = &p->opt[posPrev];
+      if (pos < LZMA_NUM_REPS)
+      {
+        UInt32 i;
+        reps[0] = prevOpt->backs[pos];
+        for (i = 1; i <= pos; i++)
+          reps[i] = prevOpt->backs[i - 1];
+        for (; i < LZMA_NUM_REPS; i++)
+          reps[i] = prevOpt->backs[i];
+      }
+      else
+      {
+        UInt32 i;
+        reps[0] = (pos - LZMA_NUM_REPS);
+        for (i = 1; i < LZMA_NUM_REPS; i++)
+          reps[i] = prevOpt->backs[i - 1];
+      }
+    }
+    curOpt->state = (CState)state;
+
+    curOpt->backs[0] = reps[0];
+    curOpt->backs[1] = reps[1];
+    curOpt->backs[2] = reps[2];
+    curOpt->backs[3] = reps[3];
+
+    curPrice = curOpt->price;
+    nextIsChar = False;
+    data = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - 1;
+    curByte = *data;
+    matchByte = *(data - (reps[0] + 1));
+
+    posState = (position & p->pbMask);
+
+    curAnd1Price = curPrice + GET_PRICE_0(p->isMatch[state][posState]);
+    {
+      const CLzmaProb *probs = LIT_PROBS(position, *(data - 1));
+      curAnd1Price +=
+        (!IsCharState(state) ?
+          LitEnc_GetPriceMatched(probs, curByte, matchByte, p->ProbPrices) :
+          LitEnc_GetPrice(probs, curByte, p->ProbPrices));
+    }
+
+    nextOpt = &p->opt[cur + 1];
+
+    if (curAnd1Price < nextOpt->price)
+    {
+      nextOpt->price = curAnd1Price;
+      nextOpt->posPrev = cur;
+      MakeAsChar(nextOpt);
+      nextIsChar = True;
+    }
+
+    matchPrice = curPrice + GET_PRICE_1(p->isMatch[state][posState]);
+    repMatchPrice = matchPrice + GET_PRICE_1(p->isRep[state]);
+
+    if (matchByte == curByte && !(nextOpt->posPrev < cur && nextOpt->backPrev == 0))
+    {
+      UInt32 shortRepPrice = repMatchPrice + GetRepLen1Price(p, state, posState);
+      if (shortRepPrice <= nextOpt->price)
+      {
+        nextOpt->price = shortRepPrice;
+        nextOpt->posPrev = cur;
+        MakeAsShortRep(nextOpt);
+        nextIsChar = True;
+      }
+    }
+    numAvailFull = p->numAvail;
+    {
+      UInt32 temp = kNumOpts - 1 - cur;
+      if (temp < numAvailFull)
+        numAvailFull = temp;
+    }
+
+    if (numAvailFull < 2)
+      continue;
+    numAvail = (numAvailFull <= p->numFastBytes ? numAvailFull : p->numFastBytes);
+
+    if (!nextIsChar && matchByte != curByte) /* speed optimization */
+    {
+      /* try Literal + rep0 */
+      UInt32 temp;
+      UInt32 lenTest2;
+      const Byte *data2 = data - (reps[0] + 1);
+      UInt32 limit = p->numFastBytes + 1;
+      if (limit > numAvailFull)
+        limit = numAvailFull;
+
+      for (temp = 1; temp < limit && data[temp] == data2[temp]; temp++);
+      lenTest2 = temp - 1;
+      if (lenTest2 >= 2)
+      {
+        UInt32 state2 = kLiteralNextStates[state];
+        UInt32 posStateNext = (position + 1) & p->pbMask;
+        UInt32 nextRepMatchPrice = curAnd1Price +
+            GET_PRICE_1(p->isMatch[state2][posStateNext]) +
+            GET_PRICE_1(p->isRep[state2]);
+        /* for (; lenTest2 >= 2; lenTest2--) */
+        {
+          UInt32 curAndLenPrice;
+          COptimal *opt;
+          UInt32 offset = cur + 1 + lenTest2;
+          while (lenEnd < offset)
+            p->opt[++lenEnd].price = kInfinityPrice;
+          curAndLenPrice = nextRepMatchPrice + GetRepPrice(p, 0, lenTest2, state2, posStateNext);
+          opt = &p->opt[offset];
+          if (curAndLenPrice < opt->price)
+          {
+            opt->price = curAndLenPrice;
+            opt->posPrev = cur + 1;
+            opt->backPrev = 0;
+            opt->prev1IsChar = True;
+            opt->prev2 = False;
+          }
+        }
+      }
+    }
+
+    startLen = 2; /* speed optimization */
+    {
+    UInt32 repIndex;
+    for (repIndex = 0; repIndex < LZMA_NUM_REPS; repIndex++)
+    {
+      UInt32 lenTest;
+      UInt32 lenTestTemp;
+      UInt32 price;
+      const Byte *data2 = data - (reps[repIndex] + 1);
+      if (data[0] != data2[0] || data[1] != data2[1])
+        continue;
+      for (lenTest = 2; lenTest < numAvail && data[lenTest] == data2[lenTest]; lenTest++);
+      while (lenEnd < cur + lenTest)
+        p->opt[++lenEnd].price = kInfinityPrice;
+      lenTestTemp = lenTest;
+      price = repMatchPrice + GetPureRepPrice(p, repIndex, state, posState);
+      do
+      {
+        UInt32 curAndLenPrice = price + p->repLenEnc.prices[posState][lenTest - 2];
+        COptimal *opt = &p->opt[cur + lenTest];
+        if (curAndLenPrice < opt->price)
+        {
+          opt->price = curAndLenPrice;
+          opt->posPrev = cur;
+          opt->backPrev = repIndex;
+          opt->prev1IsChar = False;
+        }
+      }
+      while (--lenTest >= 2);
+      lenTest = lenTestTemp;
+
+      if (repIndex == 0)
+        startLen = lenTest + 1;
+
+      /* if (_maxMode) */
+        {
+          UInt32 lenTest2 = lenTest + 1;
+          UInt32 limit = lenTest2 + p->numFastBytes;
+          UInt32 nextRepMatchPrice;
+          if (limit > numAvailFull)
+            limit = numAvailFull;
+          for (; lenTest2 < limit && data[lenTest2] == data2[lenTest2]; lenTest2++);
+          lenTest2 -= lenTest + 1;
+          if (lenTest2 >= 2)
+          {
+            UInt32 state2 = kRepNextStates[state];
+            UInt32 posStateNext = (position + lenTest) & p->pbMask;
+            UInt32 curAndLenCharPrice =
+                price + p->repLenEnc.prices[posState][lenTest - 2] +
+                GET_PRICE_0(p->isMatch[state2][posStateNext]) +
+                LitEnc_GetPriceMatched(LIT_PROBS(position + lenTest, data[lenTest - 1]),
+                    data[lenTest], data2[lenTest], p->ProbPrices);
+            state2 = kLiteralNextStates[state2];
+            posStateNext = (position + lenTest + 1) & p->pbMask;
+            nextRepMatchPrice = curAndLenCharPrice +
+                GET_PRICE_1(p->isMatch[state2][posStateNext]) +
+                GET_PRICE_1(p->isRep[state2]);
+
+            /* for (; lenTest2 >= 2; lenTest2--) */
+            {
+              UInt32 curAndLenPrice;
+              COptimal *opt;
+              UInt32 offset = cur + lenTest + 1 + lenTest2;
+              while (lenEnd < offset)
+                p->opt[++lenEnd].price = kInfinityPrice;
+              curAndLenPrice = nextRepMatchPrice + GetRepPrice(p, 0, lenTest2, state2, posStateNext);
+              opt = &p->opt[offset];
+              if (curAndLenPrice < opt->price)
+              {
+                opt->price = curAndLenPrice;
+                opt->posPrev = cur + lenTest + 1;
+                opt->backPrev = 0;
+                opt->prev1IsChar = True;
+                opt->prev2 = True;
+                opt->posPrev2 = cur;
+                opt->backPrev2 = repIndex;
+              }
+            }
+          }
+        }
+    }
+    }
+    /* for (UInt32 lenTest = 2; lenTest <= newLen; lenTest++) */
+    if (newLen > numAvail)
+    {
+      newLen = numAvail;
+      for (numPairs = 0; newLen > matches[numPairs]; numPairs += 2);
+      matches[numPairs] = newLen;
+      numPairs += 2;
+    }
+    if (newLen >= startLen)
+    {
+      UInt32 normalMatchPrice = matchPrice + GET_PRICE_0(p->isRep[state]);
+      UInt32 offs, curBack, posSlot;
+      UInt32 lenTest;
+      while (lenEnd < cur + newLen)
+        p->opt[++lenEnd].price = kInfinityPrice;
+
+      offs = 0;
+      while (startLen > matches[offs])
+        offs += 2;
+      curBack = matches[offs + 1];
+      GetPosSlot2(curBack, posSlot);
+      for (lenTest = /*2*/ startLen; ; lenTest++)
+      {
+        UInt32 curAndLenPrice = normalMatchPrice + p->lenEnc.prices[posState][lenTest - LZMA_MATCH_LEN_MIN];
+        UInt32 lenToPosState = GetLenToPosState(lenTest);
+        COptimal *opt;
+        if (curBack < kNumFullDistances)
+          curAndLenPrice += p->distancesPrices[lenToPosState][curBack];
+        else
+          curAndLenPrice += p->posSlotPrices[lenToPosState][posSlot] + p->alignPrices[curBack & kAlignMask];
+
+        opt = &p->opt[cur + lenTest];
+        if (curAndLenPrice < opt->price)
+        {
+          opt->price = curAndLenPrice;
+          opt->posPrev = cur;
+          opt->backPrev = curBack + LZMA_NUM_REPS;
+          opt->prev1IsChar = False;
+        }
+
+        if (/*_maxMode && */lenTest == matches[offs])
+        {
+          /* Try Match + Literal + Rep0 */
+          const Byte *data2 = data - (curBack + 1);
+          UInt32 lenTest2 = lenTest + 1;
+          UInt32 limit = lenTest2 + p->numFastBytes;
+          UInt32 nextRepMatchPrice;
+          if (limit > numAvailFull)
+            limit = numAvailFull;
+          for (; lenTest2 < limit && data[lenTest2] == data2[lenTest2]; lenTest2++);
+          lenTest2 -= lenTest + 1;
+          if (lenTest2 >= 2)
+          {
+            UInt32 state2 = kMatchNextStates[state];
+            UInt32 posStateNext = (position + lenTest) & p->pbMask;
+            UInt32 curAndLenCharPrice = curAndLenPrice +
+                GET_PRICE_0(p->isMatch[state2][posStateNext]) +
+                LitEnc_GetPriceMatched(LIT_PROBS(position + lenTest, data[lenTest - 1]),
+                    data[lenTest], data2[lenTest], p->ProbPrices);
+            state2 = kLiteralNextStates[state2];
+            posStateNext = (posStateNext + 1) & p->pbMask;
+            nextRepMatchPrice = curAndLenCharPrice +
+                GET_PRICE_1(p->isMatch[state2][posStateNext]) +
+                GET_PRICE_1(p->isRep[state2]);
+
+            /* for (; lenTest2 >= 2; lenTest2--) */
+            {
+              UInt32 offset = cur + lenTest + 1 + lenTest2;
+              UInt32 curAndLenPrice;
+              COptimal *opt;
+              while (lenEnd < offset)
+                p->opt[++lenEnd].price = kInfinityPrice;
+              curAndLenPrice = nextRepMatchPrice + GetRepPrice(p, 0, lenTest2, state2, posStateNext);
+              opt = &p->opt[offset];
+              if (curAndLenPrice < opt->price)
+              {
+                opt->price = curAndLenPrice;
+                opt->posPrev = cur + lenTest + 1;
+                opt->backPrev = 0;
+                opt->prev1IsChar = True;
+                opt->prev2 = True;
+                opt->posPrev2 = cur;
+                opt->backPrev2 = curBack + LZMA_NUM_REPS;
+              }
+            }
+          }
+          offs += 2;
+          if (offs == numPairs)
+            break;
+          curBack = matches[offs + 1];
+          if (curBack >= kNumFullDistances)
+            GetPosSlot2(curBack, posSlot);
+        }
+      }
+    }
+  }
+}
+
+#define ChangePair(smallDist, bigDist) (((bigDist) >> 7) > (smallDist))
+
+static UInt32 GetOptimumFast(CLzmaEnc *p, UInt32 *backRes)
+{
+  UInt32 numAvail, mainLen, mainDist, numPairs, repIndex, repLen, i;
+  const Byte *data;
+  const UInt32 *matches;
+
+  if (p->additionalOffset == 0)
+    mainLen = ReadMatchDistances(p, &numPairs);
+  else
+  {
+    mainLen = p->longestMatchLength;
+    numPairs = p->numPairs;
+  }
+
+  numAvail = p->numAvail;
+  *backRes = (UInt32)-1;
+  if (numAvail < 2)
+    return 1;
+  if (numAvail > LZMA_MATCH_LEN_MAX)
+    numAvail = LZMA_MATCH_LEN_MAX;
+  data = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - 1;
+
+  repLen = repIndex = 0;
+  for (i = 0; i < LZMA_NUM_REPS; i++)
+  {
+    UInt32 len;
+    const Byte *data2 = data - (p->reps[i] + 1);
+    if (data[0] != data2[0] || data[1] != data2[1])
+      continue;
+    for (len = 2; len < numAvail && data[len] == data2[len]; len++);
+    if (len >= p->numFastBytes)
+    {
+      *backRes = i;
+      MovePos(p, len - 1);
+      return len;
+    }
+    if (len > repLen)
+    {
+      repIndex = i;
+      repLen = len;
+    }
+  }
+
+  matches = p->matches;
+  if (mainLen >= p->numFastBytes)
+  {
+    *backRes = matches[numPairs - 1] + LZMA_NUM_REPS;
+    MovePos(p, mainLen - 1);
+    return mainLen;
+  }
+
+  mainDist = 0; /* for GCC */
+  if (mainLen >= 2)
+  {
+    mainDist = matches[numPairs - 1];
+    while (numPairs > 2 && mainLen == matches[numPairs - 4] + 1)
+    {
+      if (!ChangePair(matches[numPairs - 3], mainDist))
+        break;
+      numPairs -= 2;
+      mainLen = matches[numPairs - 2];
+      mainDist = matches[numPairs - 1];
+    }
+    if (mainLen == 2 && mainDist >= 0x80)
+      mainLen = 1;
+  }
+
+  if (repLen >= 2 && (
+        (repLen + 1 >= mainLen) ||
+        (repLen + 2 >= mainLen && mainDist >= (1 << 9)) ||
+        (repLen + 3 >= mainLen && mainDist >= (1 << 15))))
+  {
+    *backRes = repIndex;
+    MovePos(p, repLen - 1);
+    return repLen;
+  }
+
+  if (mainLen < 2 || numAvail <= 2)
+    return 1;
+
+  p->longestMatchLength = ReadMatchDistances(p, &p->numPairs);
+  if (p->longestMatchLength >= 2)
+  {
+    UInt32 newDistance = matches[p->numPairs - 1];
+    if ((p->longestMatchLength >= mainLen && newDistance < mainDist) ||
+        (p->longestMatchLength == mainLen + 1 && !ChangePair(mainDist, newDistance)) ||
+        (p->longestMatchLength > mainLen + 1) ||
+        (p->longestMatchLength + 1 >= mainLen && mainLen >= 3 && ChangePair(newDistance, mainDist)))
+      return 1;
+  }
+
+  data = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - 1;
+  for (i = 0; i < LZMA_NUM_REPS; i++)
+  {
+    UInt32 len, limit;
+    const Byte *data2 = data - (p->reps[i] + 1);
+    if (data[0] != data2[0] || data[1] != data2[1])
+      continue;
+    limit = mainLen - 1;
+    for (len = 2; len < limit && data[len] == data2[len]; len++);
+    if (len >= limit)
+      return 1;
+  }
+  *backRes = mainDist + LZMA_NUM_REPS;
+  MovePos(p, mainLen - 2);
+  return mainLen;
+}
+
+static void WriteEndMarker(CLzmaEnc *p, UInt32 posState)
+{
+  UInt32 len;
+  RangeEnc_EncodeBit(&p->rc, &p->isMatch[p->state][posState], 1);
+  RangeEnc_EncodeBit(&p->rc, &p->isRep[p->state], 0);
+  p->state = kMatchNextStates[p->state];
+  len = LZMA_MATCH_LEN_MIN;
+  LenEnc_Encode2(&p->lenEnc, &p->rc, len - LZMA_MATCH_LEN_MIN, posState, !p->fastMode, p->ProbPrices);
+  RcTree_Encode(&p->rc, p->posSlotEncoder[GetLenToPosState(len)], kNumPosSlotBits, (1 << kNumPosSlotBits) - 1);
+  RangeEnc_EncodeDirectBits(&p->rc, (((UInt32)1 << 30) - 1) >> kNumAlignBits, 30 - kNumAlignBits);
+  RcTree_ReverseEncode(&p->rc, p->posAlignEncoder, kNumAlignBits, kAlignMask);
+}
+
+static SRes CheckErrors(CLzmaEnc *p)
+{
+  if (p->result != SZ_OK)
+    return p->result;
+  if (p->rc.res != SZ_OK)
+    p->result = SZ_ERROR_WRITE;
+  if (p->matchFinderBase.result != SZ_OK)
+    p->result = SZ_ERROR_READ;
+  if (p->result != SZ_OK)
+    p->finished = True;
+  return p->result;
+}
+
+static SRes Flush(CLzmaEnc *p, UInt32 nowPos)
+{
+  /* ReleaseMFStream(); */
+  p->finished = True;
+  if (p->writeEndMark)
+    WriteEndMarker(p, nowPos & p->pbMask);
+  RangeEnc_FlushData(&p->rc);
+  RangeEnc_FlushStream(&p->rc);
+  return CheckErrors(p);
+}
+
+static void FillAlignPrices(CLzmaEnc *p)
+{
+  UInt32 i;
+  for (i = 0; i < kAlignTableSize; i++)
+    p->alignPrices[i] = RcTree_ReverseGetPrice(p->posAlignEncoder, kNumAlignBits, i, p->ProbPrices);
+  p->alignPriceCount = 0;
+}
+
+static void FillDistancesPrices(CLzmaEnc *p)
+{
+  UInt32 tempPrices[kNumFullDistances];
+  UInt32 i, lenToPosState;
+  for (i = kStartPosModelIndex; i < kNumFullDistances; i++)
+  {
+    UInt32 posSlot = GetPosSlot1(i);
+    UInt32 footerBits = ((posSlot >> 1) - 1);
+    UInt32 base = ((2 | (posSlot & 1)) << footerBits);
+    tempPrices[i] = RcTree_ReverseGetPrice(p->posEncoders + base - posSlot - 1, footerBits, i - base, p->ProbPrices);
+  }
+
+  for (lenToPosState = 0; lenToPosState < kNumLenToPosStates; lenToPosState++)
+  {
+    UInt32 posSlot;
+    const CLzmaProb *encoder = p->posSlotEncoder[lenToPosState];
+    UInt32 *posSlotPrices = p->posSlotPrices[lenToPosState];
+    for (posSlot = 0; posSlot < p->distTableSize; posSlot++)
+      posSlotPrices[posSlot] = RcTree_GetPrice(encoder, kNumPosSlotBits, posSlot, p->ProbPrices);
+    for (posSlot = kEndPosModelIndex; posSlot < p->distTableSize; posSlot++)
+      posSlotPrices[posSlot] += ((((posSlot >> 1) - 1) - kNumAlignBits) << kNumBitPriceShiftBits);
+
+    {
+      UInt32 *distancesPrices = p->distancesPrices[lenToPosState];
+      UInt32 i;
+      for (i = 0; i < kStartPosModelIndex; i++)
+        distancesPrices[i] = posSlotPrices[i];
+      for (; i < kNumFullDistances; i++)
+        distancesPrices[i] = posSlotPrices[GetPosSlot1(i)] + tempPrices[i];
+    }
+  }
+  p->matchPriceCount = 0;
+}
+
+static void LzmaEnc_Construct(CLzmaEnc *p)
+{
+  RangeEnc_Construct(&p->rc);
+  MatchFinder_Construct(&p->matchFinderBase);
+  #ifndef _7ZIP_ST
+  MatchFinderMt_Construct(&p->matchFinderMt);
+  p->matchFinderMt.MatchFinder = &p->matchFinderBase;
+  #endif
+
+  {
+    CLzmaEncProps props;
+    LzmaEncProps_Init(&props);
+    LzmaEnc_SetProps(p, &props);
+  }
+
+  #ifndef LZMA_LOG_BSR
+  LzmaEnc_FastPosInit(p->g_FastPos);
+  #endif
+
+  LzmaEnc_InitPriceTables(p->ProbPrices);
+  p->litProbs = 0;
+  p->saveState.litProbs = 0;
+}
+
+CLzmaEncHandle LzmaEnc_Create(ISzAlloc *alloc)
+{
+  void *p;
+  p = alloc->Alloc(alloc, sizeof(CLzmaEnc));
+  if (p != 0)
+    LzmaEnc_Construct((CLzmaEnc *)p);
+  return p;
+}
+
+static void LzmaEnc_FreeLits(CLzmaEnc *p, ISzAlloc *alloc)
+{
+  alloc->Free(alloc, p->litProbs);
+  alloc->Free(alloc, p->saveState.litProbs);
+  p->litProbs = 0;
+  p->saveState.litProbs = 0;
+}
+
+static void LzmaEnc_Destruct(CLzmaEnc *p, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  #ifndef _7ZIP_ST
+  MatchFinderMt_Destruct(&p->matchFinderMt, allocBig);
+  #endif
+  MatchFinder_Free(&p->matchFinderBase, allocBig);
+  LzmaEnc_FreeLits(p, alloc);
+  RangeEnc_Free(&p->rc, alloc);
+}
+
+void LzmaEnc_Destroy(CLzmaEncHandle p, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  LzmaEnc_Destruct((CLzmaEnc *)p, alloc, allocBig);
+  alloc->Free(alloc, p);
+}
+
+static SRes LzmaEnc_CodeOneBlock(CLzmaEnc *p, Bool useLimits, UInt32 maxPackSize, UInt32 maxUnpackSize)
+{
+  UInt32 nowPos32, startPos32;
+  if (p->needInit)
+  {
+    p->matchFinder.Init(p->matchFinderObj);
+    p->needInit = 0;
+  }
+
+  if (p->finished)
+    return p->result;
+  RINOK(CheckErrors(p));
+
+  nowPos32 = (UInt32)p->nowPos64;
+  startPos32 = nowPos32;
+
+  if (p->nowPos64 == 0)
+  {
+    UInt32 numPairs;
+    Byte curByte;
+    if (p->matchFinder.GetNumAvailableBytes(p->matchFinderObj) == 0)
+      return Flush(p, nowPos32);
+    ReadMatchDistances(p, &numPairs);
+    RangeEnc_EncodeBit(&p->rc, &p->isMatch[p->state][0], 0);
+    p->state = kLiteralNextStates[p->state];
+    curByte = p->matchFinder.GetIndexByte(p->matchFinderObj, 0 - p->additionalOffset);
+    LitEnc_Encode(&p->rc, p->litProbs, curByte);
+    p->additionalOffset--;
+    nowPos32++;
+  }
+
+  if (p->matchFinder.GetNumAvailableBytes(p->matchFinderObj) != 0)
+  for (;;)
+  {
+    UInt32 pos, len, posState;
+
+    if (p->fastMode)
+      len = GetOptimumFast(p, &pos);
+    else
+      len = GetOptimum(p, nowPos32, &pos);
+
+    #ifdef SHOW_STAT2
+    printf("\n pos = %4X,   len = %d   pos = %d", nowPos32, len, pos);
+    #endif
+
+    posState = nowPos32 & p->pbMask;
+    if (len == 1 && pos == (UInt32)-1)
+    {
+      Byte curByte;
+      CLzmaProb *probs;
+      const Byte *data;
+
+      RangeEnc_EncodeBit(&p->rc, &p->isMatch[p->state][posState], 0);
+      data = p->matchFinder.GetPointerToCurrentPos(p->matchFinderObj) - p->additionalOffset;
+      curByte = *data;
+      probs = LIT_PROBS(nowPos32, *(data - 1));
+      if (IsCharState(p->state))
+        LitEnc_Encode(&p->rc, probs, curByte);
+      else
+        LitEnc_EncodeMatched(&p->rc, probs, curByte, *(data - p->reps[0] - 1));
+      p->state = kLiteralNextStates[p->state];
+    }
+    else
+    {
+      RangeEnc_EncodeBit(&p->rc, &p->isMatch[p->state][posState], 1);
+      if (pos < LZMA_NUM_REPS)
+      {
+        RangeEnc_EncodeBit(&p->rc, &p->isRep[p->state], 1);
+        if (pos == 0)
+        {
+          RangeEnc_EncodeBit(&p->rc, &p->isRepG0[p->state], 0);
+          RangeEnc_EncodeBit(&p->rc, &p->isRep0Long[p->state][posState], ((len == 1) ? 0 : 1));
+        }
+        else
+        {
+          UInt32 distance = p->reps[pos];
+          RangeEnc_EncodeBit(&p->rc, &p->isRepG0[p->state], 1);
+          if (pos == 1)
+            RangeEnc_EncodeBit(&p->rc, &p->isRepG1[p->state], 0);
+          else
+          {
+            RangeEnc_EncodeBit(&p->rc, &p->isRepG1[p->state], 1);
+            RangeEnc_EncodeBit(&p->rc, &p->isRepG2[p->state], pos - 2);
+            if (pos == 3)
+              p->reps[3] = p->reps[2];
+            p->reps[2] = p->reps[1];
+          }
+          p->reps[1] = p->reps[0];
+          p->reps[0] = distance;
+        }
+        if (len == 1)
+          p->state = kShortRepNextStates[p->state];
+        else
+        {
+          LenEnc_Encode2(&p->repLenEnc, &p->rc, len - LZMA_MATCH_LEN_MIN, posState, !p->fastMode, p->ProbPrices);
+          p->state = kRepNextStates[p->state];
+        }
+      }
+      else
+      {
+        UInt32 posSlot;
+        RangeEnc_EncodeBit(&p->rc, &p->isRep[p->state], 0);
+        p->state = kMatchNextStates[p->state];
+        LenEnc_Encode2(&p->lenEnc, &p->rc, len - LZMA_MATCH_LEN_MIN, posState, !p->fastMode, p->ProbPrices);
+        pos -= LZMA_NUM_REPS;
+        GetPosSlot(pos, posSlot);
+        RcTree_Encode(&p->rc, p->posSlotEncoder[GetLenToPosState(len)], kNumPosSlotBits, posSlot);
+
+        if (posSlot >= kStartPosModelIndex)
+        {
+          UInt32 footerBits = ((posSlot >> 1) - 1);
+          UInt32 base = ((2 | (posSlot & 1)) << footerBits);
+          UInt32 posReduced = pos - base;
+
+          if (posSlot < kEndPosModelIndex)
+            RcTree_ReverseEncode(&p->rc, p->posEncoders + base - posSlot - 1, footerBits, posReduced);
+          else
+          {
+            RangeEnc_EncodeDirectBits(&p->rc, posReduced >> kNumAlignBits, footerBits - kNumAlignBits);
+            RcTree_ReverseEncode(&p->rc, p->posAlignEncoder, kNumAlignBits, posReduced & kAlignMask);
+            p->alignPriceCount++;
+          }
+        }
+        p->reps[3] = p->reps[2];
+        p->reps[2] = p->reps[1];
+        p->reps[1] = p->reps[0];
+        p->reps[0] = pos;
+        p->matchPriceCount++;
+      }
+    }
+    p->additionalOffset -= len;
+    nowPos32 += len;
+    if (p->additionalOffset == 0)
+    {
+      UInt32 processed;
+      if (!p->fastMode)
+      {
+        if (p->matchPriceCount >= (1 << 7))
+          FillDistancesPrices(p);
+        if (p->alignPriceCount >= kAlignTableSize)
+          FillAlignPrices(p);
+      }
+      if (p->matchFinder.GetNumAvailableBytes(p->matchFinderObj) == 0)
+        break;
+      processed = nowPos32 - startPos32;
+      if (useLimits)
+      {
+        if (processed + kNumOpts + 300 >= maxUnpackSize ||
+            RangeEnc_GetProcessed(&p->rc) + kNumOpts * 2 >= maxPackSize)
+          break;
+      }
+      else if (processed >= (1 << 15))
+      {
+        p->nowPos64 += nowPos32 - startPos32;
+        return CheckErrors(p);
+      }
+    }
+  }
+  p->nowPos64 += nowPos32 - startPos32;
+  return Flush(p, nowPos32);
+}
+
+#define kBigHashDicLimit ((UInt32)1 << 24)
+
+static SRes LzmaEnc_Alloc(CLzmaEnc *p, UInt32 keepWindowSize, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  UInt32 beforeSize = kNumOpts;
+  Bool btMode;
+  if (!RangeEnc_Alloc(&p->rc, alloc))
+    return SZ_ERROR_MEM;
+  btMode = (p->matchFinderBase.btMode != 0);
+  #ifndef _7ZIP_ST
+  p->mtMode = (p->multiThread && !p->fastMode && btMode);
+  #endif
+
+  {
+    unsigned lclp = p->lc + p->lp;
+    if (p->litProbs == 0 || p->saveState.litProbs == 0 || p->lclp != lclp)
+    {
+      LzmaEnc_FreeLits(p, alloc);
+      p->litProbs = (CLzmaProb *)alloc->Alloc(alloc, (0x300 << lclp) * sizeof(CLzmaProb));
+      p->saveState.litProbs = (CLzmaProb *)alloc->Alloc(alloc, (0x300 << lclp) * sizeof(CLzmaProb));
+      if (p->litProbs == 0 || p->saveState.litProbs == 0)
+      {
+        LzmaEnc_FreeLits(p, alloc);
+        return SZ_ERROR_MEM;
+      }
+      p->lclp = lclp;
+    }
+  }
+
+  p->matchFinderBase.bigHash = (p->dictSize > kBigHashDicLimit);
+
+  if (beforeSize + p->dictSize < keepWindowSize)
+    beforeSize = keepWindowSize - p->dictSize;
+
+  #ifndef _7ZIP_ST
+  if (p->mtMode)
+  {
+    RINOK(MatchFinderMt_Create(&p->matchFinderMt, p->dictSize, beforeSize, p->numFastBytes, LZMA_MATCH_LEN_MAX, allocBig));
+    p->matchFinderObj = &p->matchFinderMt;
+    MatchFinderMt_CreateVTable(&p->matchFinderMt, &p->matchFinder);
+  }
+  else
+  #endif
+  {
+    if (!MatchFinder_Create(&p->matchFinderBase, p->dictSize, beforeSize, p->numFastBytes, LZMA_MATCH_LEN_MAX, allocBig))
+      return SZ_ERROR_MEM;
+    p->matchFinderObj = &p->matchFinderBase;
+    MatchFinder_CreateVTable(&p->matchFinderBase, &p->matchFinder);
+  }
+  return SZ_OK;
+}
+
+static void LzmaEnc_Init(CLzmaEnc *p)
+{
+  UInt32 i;
+  p->state = 0;
+  for (i = 0 ; i < LZMA_NUM_REPS; i++)
+    p->reps[i] = 0;
+
+  RangeEnc_Init(&p->rc);
+
+
+  for (i = 0; i < kNumStates; i++)
+  {
+    UInt32 j;
+    for (j = 0; j < LZMA_NUM_PB_STATES_MAX; j++)
+    {
+      p->isMatch[i][j] = kProbInitValue;
+      p->isRep0Long[i][j] = kProbInitValue;
+    }
+    p->isRep[i] = kProbInitValue;
+    p->isRepG0[i] = kProbInitValue;
+    p->isRepG1[i] = kProbInitValue;
+    p->isRepG2[i] = kProbInitValue;
+  }
+
+  {
+    UInt32 num = 0x300 << (p->lp + p->lc);
+    for (i = 0; i < num; i++)
+      p->litProbs[i] = kProbInitValue;
+  }
+
+  {
+    for (i = 0; i < kNumLenToPosStates; i++)
+    {
+      CLzmaProb *probs = p->posSlotEncoder[i];
+      UInt32 j;
+      for (j = 0; j < (1 << kNumPosSlotBits); j++)
+        probs[j] = kProbInitValue;
+    }
+  }
+  {
+    for (i = 0; i < kNumFullDistances - kEndPosModelIndex; i++)
+      p->posEncoders[i] = kProbInitValue;
+  }
+
+  LenEnc_Init(&p->lenEnc.p);
+  LenEnc_Init(&p->repLenEnc.p);
+
+  for (i = 0; i < (1 << kNumAlignBits); i++)
+    p->posAlignEncoder[i] = kProbInitValue;
+
+  p->optimumEndIndex = 0;
+  p->optimumCurrentIndex = 0;
+  p->additionalOffset = 0;
+
+  p->pbMask = (1 << p->pb) - 1;
+  p->lpMask = (1 << p->lp) - 1;
+}
+
+static void LzmaEnc_InitPrices(CLzmaEnc *p)
+{
+  if (!p->fastMode)
+  {
+    FillDistancesPrices(p);
+    FillAlignPrices(p);
+  }
+
+  p->lenEnc.tableSize =
+  p->repLenEnc.tableSize =
+      p->numFastBytes + 1 - LZMA_MATCH_LEN_MIN;
+  LenPriceEnc_UpdateTables(&p->lenEnc, 1 << p->pb, p->ProbPrices);
+  LenPriceEnc_UpdateTables(&p->repLenEnc, 1 << p->pb, p->ProbPrices);
+}
+
+static SRes LzmaEnc_AllocAndInit(CLzmaEnc *p, UInt32 keepWindowSize, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  UInt32 i;
+  for (i = 0; i < (UInt32)kDicLogSizeMaxCompress; i++)
+    if (p->dictSize <= ((UInt32)1 << i))
+      break;
+  p->distTableSize = i * 2;
+
+  p->finished = False;
+  p->result = SZ_OK;
+  RINOK(LzmaEnc_Alloc(p, keepWindowSize, alloc, allocBig));
+  LzmaEnc_Init(p);
+  LzmaEnc_InitPrices(p);
+  p->nowPos64 = 0;
+  return SZ_OK;
+}
+
+static void LzmaEnc_SetInputBuf(CLzmaEnc *p, const Byte *src, SizeT srcLen)
+{
+  p->matchFinderBase.directInput = 1;
+  p->matchFinderBase.bufferBase = (Byte *)src;
+  p->matchFinderBase.directInputRem = srcLen;
+}
+
+static SRes LzmaEnc_MemPrepare(CLzmaEncHandle pp, const Byte *src, SizeT srcLen,
+    UInt32 keepWindowSize, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  CLzmaEnc *p = (CLzmaEnc *)pp;
+  LzmaEnc_SetInputBuf(p, src, srcLen);
+  p->needInit = 1;
+
+  return LzmaEnc_AllocAndInit(p, keepWindowSize, alloc, allocBig);
+}
+
+static void LzmaEnc_Finish(CLzmaEncHandle pp)
+{
+  #ifndef _7ZIP_ST
+  CLzmaEnc *p = (CLzmaEnc *)pp;
+  if (p->mtMode)
+    MatchFinderMt_ReleaseStream(&p->matchFinderMt);
+  #else
+  pp = pp;
+  #endif
+}
+
+typedef struct
+{
+  ISeqOutStream funcTable;
+  Byte *data;
+  SizeT rem;
+  Bool overflow;
+} CSeqOutStreamBuf;
+
+static size_t MyWrite(void *pp, const void *data, size_t size)
+{
+  CSeqOutStreamBuf *p = (CSeqOutStreamBuf *)pp;
+  if (p->rem < size)
+  {
+    size = p->rem;
+    p->overflow = True;
+  }
+  memcpy(p->data, data, size);
+  p->rem -= size;
+  p->data += size;
+  return size;
+}
+
+static SRes LzmaEnc_Encode2(CLzmaEnc *p, ICompressProgress *progress)
+{
+  SRes res = SZ_OK;
+
+  #ifndef _7ZIP_ST
+  Byte allocaDummy[0x300];
+  int i = 0;
+  for (i = 0; i < 16; i++)
+    allocaDummy[i] = (Byte)i;
+  #endif
+
+  for (;;)
+  {
+    res = LzmaEnc_CodeOneBlock(p, False, 0, 0);
+    if (res != SZ_OK || p->finished != 0)
+      break;
+    if (progress != 0)
+    {
+      res = progress->Progress(progress, p->nowPos64, RangeEnc_GetProcessed(&p->rc));
+      if (res != SZ_OK)
+      {
+        res = SZ_ERROR_PROGRESS;
+        break;
+      }
+    }
+  }
+  LzmaEnc_Finish(p);
+  return res;
+}
+
+SRes LzmaEnc_WriteProperties(CLzmaEncHandle pp, Byte *props, SizeT *size)
+{
+  CLzmaEnc *p = (CLzmaEnc *)pp;
+  int i;
+  UInt32 dictSize = p->dictSize;
+  if (*size < LZMA_PROPS_SIZE)
+    return SZ_ERROR_PARAM;
+  *size = LZMA_PROPS_SIZE;
+  props[0] = (Byte)((p->pb * 5 + p->lp) * 9 + p->lc);
+
+  for (i = 11; i <= 30; i++)
+  {
+    if (dictSize <= ((UInt32)2 << i))
+    {
+      dictSize = (2 << i);
+      break;
+    }
+    if (dictSize <= ((UInt32)3 << i))
+    {
+      dictSize = (3 << i);
+      break;
+    }
+  }
+
+  for (i = 0; i < 4; i++)
+    props[1 + i] = (Byte)(dictSize >> (8 * i));
+  return SZ_OK;
+}
+
+SRes LzmaEnc_MemEncode(CLzmaEncHandle pp, Byte *dest, SizeT *destLen, const Byte *src, SizeT srcLen,
+    int writeEndMark, ICompressProgress *progress, ISzAlloc *alloc, ISzAlloc *allocBig)
+{
+  SRes res;
+  CLzmaEnc *p = (CLzmaEnc *)pp;
+
+  CSeqOutStreamBuf outStream;
+
+  LzmaEnc_SetInputBuf(p, src, srcLen);
+
+  outStream.funcTable.Write = MyWrite;
+  outStream.data = dest;
+  outStream.rem = *destLen;
+  outStream.overflow = False;
+
+  p->writeEndMark = writeEndMark;
+
+  p->rc.outStream = &outStream.funcTable;
+  res = LzmaEnc_MemPrepare(pp, src, srcLen, 0, alloc, allocBig);
+  if (res == SZ_OK)
+    res = LzmaEnc_Encode2(p, progress);
+
+  *destLen -= outStream.rem;
+  if (outStream.overflow)
+    return SZ_ERROR_OUTPUT_EOF;
+  return res;
+}
--- /dev/null
+++ b/lib/lzma/Makefile
@@ -0,0 +1,7 @@
+lzma_compress-objs := LzFind.o LzmaEnc.o
+lzma_decompress-objs := LzmaDec.o
+
+obj-$(CONFIG_LZMA_COMPRESS) += lzma_compress.o
+obj-$(CONFIG_LZMA_DECOMPRESS) += lzma_decompress.o
+
+EXTRA_CFLAGS += -Iinclude/linux -Iinclude/linux/lzma -include types.h